Liacos, CJ.
From January through May, 1981, the Federal Bureau of Investigation (FBI) conducted court-authorized surveillance at 98 Prince Street and 51 North Margin [504]*504Street in the North End section of Boston.1 Utilizing audio and video equipment, Federal agents monitored and recorded arrivals and departures of persons from the above-described premises. Federal agents also monitored and recorded conversations that took place inside the premises.
Based in large part on the fruits of the electronic surveillance, a Federal grand jury returned a two-count indictment charging Gennaro Angiulo (defendant)2 with “conspiring to engage in racketeering activities, among them, conspiring to murder and being [an] accessor [y] before the fact to the murder of Angelo Patrizzi,” and substantive violations of the Racketeer Influenced and Corrupt Organizations Act (RICO), 18 U.S.C. § 1962 (c) and (d)(1988). The substantive violations alleged, inter alla, that the defendant conspired to murder Angelo Patrizzi and that the defendant was an accessory before the fact to Patrizzi’s murder.
The case was tried to a jury in the United States District Court for the District of Massachusetts. The jury convicted the defendant. The Federal judge sentenced the defendant to forty-five years in prison and fined him $120,000.
After the Federal trial, a grand - jury sitting in Essex County indicted the defendant on charges of conspiracy to murder, and of being an accessory before the fact to the murder of Angelo Patrizzi.3 The defendant moved to dismiss the indictment arguing that the prior Federal prosecution barred the Commonwealth’s prosecution. See Commonwealth v. Cepulonis, 374 Mass. 487 (1978). A judge in the [505]*505Superior Court denied the defendant’s motion to dismiss. The defendant sought interlocutory relief pursuant to G. L. c. 211, § 3 (1990 ed.). A single justice of this court reserved and reported the case to the full bench. We affirmed the motion judge’s decision in part, allowing the Commonwealth to prosecute the defendant on the charge that he was an accessory before the fact to murder in the first degree; and we reversed in part, dismissing the conspiracy count on double jeopardy grounds. Angiulo v. Commonwealth, 401 Mass. 71 (1987).
Accordingly, the defendant was tried as an accessory before the fact to murder in the first degree. See G. L. c. 274, § 2 (1990 ed.). The trial took place in December, 1987. The jury returned a verdict of guilty. The judge sentenced the defendant to a term of life imprisonment. Asserting a number of errors, the defendant appealed. The appeal was entered in the Appeals Court. We took the case on our own motion. For the reasons set forth below, we reverse the defendant’s conviction.
First, we summarize the relevant evidence. In 1978, Joseph Porter, Angelo Patrizzi’s half-brother, was shot to death. Porter’s body was found in a stolen automobile in Revere. Patrizzi believed that two individuals, Frederick Simone and Cono Frizi, were responsible, for the murder. Patrizzi resolved to kill Simone and Frizi to avenge his half-brother’s death. News of Patrizzi’s intention, however, reached Simone and Simone’s associates.4 Simone and his associates planned a preemptive strike; Patrizzi would be killed before he killed Simone or Frizi.
For some period of time up to January 26, 1981, Patrizzi had been incarcerated for criminal offenses unrelated to the present case. On January 26, Patrizzi was transferred to a half-way house. While a resident of the half-way house, Pa-trizzi was “employed” at Surf Auto Body in Revere. At trial, the director of the half-way house testified that Patrizzi’s [506]*506transition back into society did not proceed smoothly. He recalled a day in February, 1981, when Patrizzi was visibly upset and carried on in a manner that disturbed the other residents and the staff. In response, the director summoned Patrizzi to a meeting where he attempted to calm Patrizzi. In response to the director’s queries, Patrizzi responded, as told by the director, “They killed my brother .... I’ve got to get them.” On March 3, 1981, the director listed Patrizzi as being on “escape status.”
On March 11, 1981, the FBI intercepted a conversation, which occurred at 98 Prince Street, among the defendant, Samuel Granito, and Simone. The conversation reveals that the defendant knew about Patrizzi’s intentions as well as the plot to kill Patrizzi. Granito and Simone told the defendant that they had unsuccessfully attempted to kill Patrizzi on two occasions. Granito and Simone also told the defendant that Patrizzi had been given money, gold, clothing, and a “no-show” job at Surf Auto Body so they would know of his whereabouts. Nonetheless, Patrizzi had disappeared. The defendant expressed his displeasure that the plan to kill Pa-trizzi had gone awry and demanded an explanation as to how he had eluded them. Later, the defendant affirmed the need to kill Patrizzi.
On March 12, 1981, the FBI intercepted a conversation, which also occurred at 98 Prince Street, between the defendant and another associate, Ilario Zannino. During the conversation, the defendant told Zannino about his conversation with Granito and Simone. The defendant asked Zannino to assist with the Patrizzi “problem.” The defendant, having been previously informed that Patrizzi was hiding in the South Boston section of Boston, told Zannino that he would give him Patrizzi’s telephone number when he received it. Zannino expressed some concern: he wanted to make sure that he “hit” the right man. Zannino said he knew “what to do” after he acquired Patrizzi’s telephone number.
On April 3, 1981, the FBI intercepted a conversation of Zannino and two associates, Ralph Lamattina and Johnny Cincotti. The conversation took place at 51 North Margin [507]*507Street. Referring to Patrizzi, Zannino told Lamattina and Cincotti that Patrizzi had been “clipped” and his body put in a trunk. Zannino cautioned the men to keep silent about this development.
On June 11, 1981, Lynn police found Patrizzi’s body in the trunk of an automobile. The Lynn police officer who discovered the body testified that Patrizzi had been “hog-tied.” Patrizzi’s legs were bent from his knees up to his buttocks. A rope was tied around his ankles. It extended up his back and was knotted around his neck. The rope was “fairly” taut. The officer testified that Patrizzi’s body was found inside a sleeping bag. Four or five strands of rope were tied around the sleeping bag.
The medical examiner conducted an autopsy on June 13, 1981. He identified Patrizzi’s corpse through medical and dental records and reported the cause of death as asphyxia due to strangulation by ligature. Patrizzi had been dead at least two weeks prior to the autopsy. The medical examiner could not determine the exact date or time of death because of the degree of decomposition of the body.
The defendant raises numerous issues on appeal. We consider only those issues that are dispositive or which may recur at a new trial and provide additional facts as necessary.
1. Jurisdiction and scope of review. After sentencing, the judge advised the defendant of his right to appeal citing G. L. c. 278, § 28 (1990 ed.). The defendant’s appeal originally was entered in the Appeals Court. In his brief, filed in the Appeals Court prior to transfer of the case to this court, the defendant argued that he is entitled to appellate review pursuant to G. L. c. 278, § 33E (1990 ed.). The defendant claims that § 33E applies, notwithstanding his conviction as an accessory before the fact to murder in the first degree, because he is a defendant in a “capital” case,5
6 as that term is used in § 33E. The defendant argues § 33E applies because [508]*508he could have been indicted and tried on the underlying substantive felony, murder in the first degree, see G. L. c. 274, § 3 (1990 ed.), and because he is subject to the same punishment as one who has been convicted of murder in the first degree as a principal, see G. L. c. 274, § 2 (1990 ed.).6 We agree.
General Laws c. 278, § 33E, vests exclusive appellate jurisdiction in capital cases in this court. The scope of review mandated by § 33E is broader than that available to a defendant in a noncapital case. Commonwealth v. Cullen, 395 Mass. 225, 228 (1985). If the defendant is a “capital” defendant as the term is used in § 33E, then he is entitled to a standard of review considerably broader than that to which he would otherwise be entitled.
We proceed to consider whether the defendant, convicted as an accessory before the fact to murder in the first degree, is a “capital” defendant as that term is used in G. L. c. 278, § 33E. We begin with the statute. Section 33E defines a capital case as “a case in which the defendant was tried on an indictment for ‘murder in the first degree and was convicted of murder in the first degree.” Given such a case, the General Court has directed us “to review the ‘whole case’ to determine whether the verdict is ‘against the law or the weight of the evidence.’ ” Dickerson v. Attorney Gen., supra at 741, quoting G. L. c. 278, § 33E. On such a finding, the statute empowers us to “ ‘order a new trial or . . . direct the entry of a verdict of a lesser degree of guilt,’ if the interests of justice so require.” Id. at 741-742. As we have stated, the “uniquely thorough review of first degree murder convictions [509]*509is warranted by the infamy of the crime and the severity of its consequences.” Id. at 744. One convicted of murder in the first degree is subject to life imprisonment without the possibility of parole. G. L. c. 265, § 2 (1990 ed.).
We hold that the statute cannot be interpreted reasonably to exclude from its sweep a defendant indicted and convicted as an accessory before the fact to murder in the first degree. General Laws c. 274, § 3, provides, in pertinent part, “Whoever counsels, hires or otherwise procures a felony to be committed may be indicted and convicted as an accessory before the fact ... or may be indicted and convicted of the substantive felony . . . .” If the Commonwealth prosecuted the defendant for murder in the first degree, as it could have, and a conviction resulted, the defendant would be a capital defendant within the meaning of § 33E. The issue as to the applicability of § 33E in this case arises solely because the Commonwealth opted to prosecute the defendant as an accessory before the fact and not for the substantive offense.
If we were to decide that § 33E applies only to those defendants convicted of murder in the first degree as principals, then the Commonwealth’s decision to prosecute the defendant as an accessory rather than for the substantive crime would adversely affect the defendant’s appellate rights. It is unlikely that the General Court intended such a construction. Cf. Commonwealth v. Connolly, 394 Mass. 169, 174 (1985) (court resolves doubts as to statute’s meaning in favor of criminal defendant). Moreover, the purposes underlying the need for plenary review under § 33E are no less present in a case where the defendant is charged as an accessory before the fact to murder in the first degree. See G. L. c. 274, § 2 (an accessory before the fact “shall be punished in the manner provided for the punishment of the principal felon”). Finally, we find further support in Grady v. Treasurer of the County of Worcester, 352 Mass. 702, 704 (1967), where we held that one convicted as an accessory before the fact to murder had committed a capital crime for the purposes of awarding attorney’s fees to the defendant’s court-appointed counsel.
[510]*510For these reasons, we conclude that the defendant is a capital defendant within the meaning of G. L. c. 278, § 33E. Accordingly, we consider his appeal in view of the requirements set forth in § 33E.
2. Grand jury proceedings. The defendant presses three arguments concerning the validity of the indictment and the conduct of the grand jury proceedings. We consider each argument in turn.
a. Sufficiency of evidence. On two occasions prior to trial, the defendant moved to dismiss the indictment on the ground that the grand jury did not receive sufficient evidence to find probable cause. See Commonwealth v. McCarthy, 385 Mass. 160 (1982). On each occasion, the motion judge, who was not the trial judge, denied the motion. The defendant claims that the motion judge erred. The defendant argues, in essence, that the quantum of evidence introduced to the grand jury was insufficient to support probable cause. Thus, the defendant argues that the indictment was “fatally defective, and all subsequent proceedings taken in reliance upon the indictment were void.” Connor v. Commonwealth, 363 Mass. 572, 574 (1973). We disagree.
In Commonwealth v. McCarthy, supra at 163, we héld that where a grand jury receives no evidence of criminality on the part of the accused, the indictment must be dismissed. In so holding we stated that “at the very least the grand jury must hear sufficient evidence to establish the identity of the accused . . . and probable cause to arrest him. . . .” (Citations omitted.) Id. This evidentiary threshold serves to protect the innocent “against unfounded criminal prosecutions.” Lataille v. District Court of E. Hampden, 366 Mass. 525, 532 (1974). See Commonwealth v. McCarthy, supra at 163 n.6. Otherwise stated, indictment only on probable cause “is justly regarded as one of the securities to the innocent against hasty, malicious and oppressive public prosecutions.” Jones v. Robbins, 8 Gray 329, 344 (1857).
We have reviewed the minutes of the grand jury proceedings. We conclude that the grand jury heard sufficient evidence to warrant a finding of probable cause. See Common[511]*511wealth v. O’Dell, 392 Mass. 445, 450-453 (1984); Commonwealth v. McCarthy, supra at 163. The grand jury had a transcript of tapes which recorded the defendant’s conversation with his associates in which there was an abundance of evidence of probable cause to believe that he was an accessory before the fact to murder. There was no error.
b. The Federal prosecutor. Mr. Ernest S. DiNisco, an assistant United States attorney, had worked on the Federal government’s case against the defendant. DiNisco was familiar with both the videotapes and audio tapes which were the cornerstone of the Federal case. See United States v. Angiulo, 897 F.2d 1169, 1176 (1st Cir.), cert. denied, 498 U.S. 845 (1990). As the Commonwealth’s case rested on some of the same recordings, the Commonwealth enlisted DiNisco’s assistance to facilitate presentation of its case to the grand jury.
At some point prior to trial, DiNisco was appointed and sworn as a special assistant district attorney. The date of DiNisco’s appointment is not clear from the record. The assistant district attorney informed the judge that DiNisco had been sworn prior to presentation of the evidence to the grand jury. Documentary evidence, in the form of a notice of appointment, indicates that DiNisco’s appointment was effective April 17, 1987, a date after the grand jury had adjourned. The notice of appointment limited the scope of DiNisco’s responsibility to the prosecution of Gennaro Angi-ulo, Ilario Zannino, Frederick Simone, and Samuel Granito.
The grand jury convened on December 3, 1986. The assistant district attorney spoke first: “Good morning, members of the Grand Jury. For the record . . . I’m an Assistant District Attorney hére in Essex County. And aiding me in the presentation of this investigation is Special Assistant District Attorney Ernest DiNisco, who is also a special attorney with the Justice Department.” The grand jury heard testimony from two witnesses. The assistant district attorney questioned the first witness. DiNisco questioned the second witness. Based on the testimony, the grand jury indicted the defendant.
[512]*512The defendant argues that DiNisco’s presence was unauthorized and, therefore, his indictment is void and his conviction must be overturned. We disagree.
In Commonwealth v. Pezzano, 387 Mass. 69, 72-73 (1982), we stated that “the presence of an unauthorized person before a grand jury will void an indictment. . . . Th[e] principle is based ‘upon the fundamental conception that proceedings before the grand jury must be in secret.’ . . . This rule of secrecy imposed on the hearings and deliberations of the grand jury derives from two significant considerations. The first is a decision to ‘save individuals from notoriety unless probable cause is found against them and an indictment is returned and disclosed. . . . The second ... is to shield grand jury proceedings from any outside influences having the potential to ‘distort their investigatory or accusatory functions. . . .’” (Citations omitted.) See Commonwealth v. Conefrey, 410 Mass. 1, 5-8 (1991).
Rule 5 (c) of the Massachusetts Rules of Criminal Procedure, 378 Mass. 850 (1979), provides: “Attorneys for the Commonwealth who are necessary or convenient to the presentation of the evidence, the witness under examination, the attorney for the witness, and such other persons who are necessary or convenient to the presentation of the evidence may be present while the grand jury is in session” (emphasis supplied).
Conflicting evidence exists in the record concerning the timing of Mr. DiNisco’s appointment as a special assistant district attorney. Thus, we shall assume that his appointment was not effective at the time of the grand jury proceedings. See Commonwealth v. Parker, 402 Mass. 333, 342 (1988). Nonetheless, DiNisco’s presence is permitted under rule 5 (c) as a person “necessary or convenient” to the presentation of evidence. Additionally, the defendant has failed to direct us to evidence tending to support the conclusion that DiNisco’s presence compromised the truth-seeking function of the grand jury proceedings. Our review of the minutes of the grand jury proceeding has revealed no such evidence.
[513]*513The defendant also argues that DiNisco should not have participated in the grand jury presentation because he was, at all relevant times, an assistant United States attorney. The defendant claims that DiNisco’s presence served to taint the grand jury proceedings because DiNisco owed his allegiance to a “different sovereign” — the Federal government. The defendant argues that the responsibility to press a criminal indictment belongs only in the hands of officers of this Commonwealth who are agents of the people. See art. 5 of the Massachusetts Declaration of Rights.
The defendant’s argument erroneously assumes that DiNisco, and not an agent of the people of the Commonwealth, controlled the presentation of the evidence in defendant’s case to the grand jury. It is clear from the minutes of the proceedings that DiNisco’s role was to assist and to aid the chief prosecutor because of his familiarity with the evidence. At no point can it fairly be said that DiNisco directed or controlled the grand jury presentation. See Commonwealth v. Beneficial Fin. Co., 360 Mass. 188, 205-206 (1971), cert. denied sub nom. Farrell v. Massachusetts, 407 U.S. 910, and sub nom. Beneficial Fin. Co. v. Massachusetts, 407 U.S. 914 (1972). So long as control of the case remained with a duly authorized member of the executive branch, here the assistant district attorney, and absent a showing of prejudice or manifest injustice resulting from DiNisco’s participation, his participation was permissible. This result would be no different if DiNisco was in fact simultaneously serving as assistant United States attorney and as special assistant district attorney.
c. The tape recordings. The grand jurors did not hear the tape recording the FBI produced during its surveillance. Rather, an FBI agent, who had identified the voices on the recordings and prepared a transcript, read portions of the transcript to the grand jury. The FBI agent testified that the transcript fairly and accurately represented the words spoken on the recordings. The FBI agent also testified that inaudible portions of the recordings were so designated in the transcript.
[514]*514The defendant asserts that the judge erred in denying the motion to dismiss the indictment due to the Commonwealth’s failure to inform the grand jurors of the “degraded” quality of the tape recordings or to play them for the grand jurors. The defendant asserts that this failure served to impair the integrity of the grand jury proceedings. See Commonwealth v. O’Dell, supra. We disagree.
In Commonwealth v. Mayfield, 398 Mass. 615, 620 (1986), we stated: “In certain instances, the failure to disclose known information may impair the grand jury proceedings. For example, presentation of a defendant’s inculpatory statements recorded in a police report, distorted by the intentional failure to disclose the defendant’s exculpatory comments interspersed in that report, impaired grand jury proceedings and required dismissal of the indictment in Commonwealth v. O’Dell, 392 Mass. 445, 448-449 (1984).” We went on to say: “To sustain a claim that the integrity of the grand jury proceeding has been impaired, not only must the evidence have been given with the knowledge that it was false or deceptive, but the false or deceptive evidence must probably have been significant in the view of the grand jury and must have been presented with the intention of obtaining an indictment.” Mayfield, supra at 621. See id. at 637 (Liacos, J., dissenting).
Such is not the case here. Assuming, arguendo, that the Commonwealth intentionally withheld the disputed information,7 the defendant has not shown that this information would have been significant in the view of the grand jury. The absence of additional information concerning the quality of the recordings did not tend to distort the incriminating nature of the evidence the grand jury had before them. Compare Commonwealth v. O’Dell, supra at 449. The integrity of the grand jury proceedings was not impaired.
3. Change of venue. On three occasions prior to trial, the defendant moved for a change in venue. On appeal, the de[515]*515fendant urges us to hold that the denial of these motions rendered nugatory his constitutional right to an impartial jury trial. The defendant argues that the prejudice of the jury should be presumed because such a high percentage of the members of the venire were disqualified due to their “knowledge” of the defendant.8 As such a high percentage of the venire members demonstrated a disqualifying prejudice, defendant argues, the reliability of the claims of impartiality of the empaneled jurors should be drawn into question. There was no error in the rulings on this point.
We begin by noting that “a change in the place of trial . . . should be ordered with ‘great caution and only after a solid foundation of fact has been first established.’ ” Commonwealth v. Bonomi, 335 Mass. 327, 333 (1957), quoting Crocker v. Superior Court, 208 Mass. 162, 180 (1911). “The existence of pretrial publicity'does not alone indicate that an impartial jury cannot be empanelled.” Commonwealth v. Jackson, 388 Mass. 98, 108 (1983), citing Dobbert v. Florida, 432 U.S. 282, 302-303 (1977). The question, properly framed, is “whether there are ‘any indications in the totality of the circumstances that [the defendant’s] trial was not fundamentally fair.’ ” Commonwealth v. Jackson, supra at 109, quoting Murphy v. Florida, 421 U.S. 794, 799 (1975).
The defendant advances an argument in which he urges us to presume prejudice in the venire because forty-two per cent of the venire was excused. We decline the defendant’s invitation to attribute the prejudice of some to the otherwise impartial jurors. Review of the transcript reveals no rational basis for such a conclusion. We note that, while forty-seven persons were disqualified due to their “knowledge” of the defendant, the source of the knowledge was not common.
For example, one prospective juror was excused because he was related by marriage. Prospective jurors were excused be[516]*516cause a family member had attended school with the defendant’s child or knew of him. A prospective juror was excused because she knew a person who was a police officer and doubted her ability to consider, on an equal footing, testimony offered to rebut that of a police officer. One prospective juror was excused because he felt that the victim got what he deserved, while another was excused because he could not have convicted the defendant. Some prospective jurors had learned of the defendant not from recent publicity but from parents or friends, and were thereby predisposed.
Given the varied reasons for the partiality we cannot say that the raw number of disqualifications, in itself, causes us to question the impartiality of the qualified jurors. It is clear from the totality of the circumstances that the defendant’s right to a fair trial was not compromised due to the judge’s failure to grant the defendant’s motion for a change in venue. The defendant has fallen far short of meeting his burden of showing that he was “generally and substantially prejudged” such that “it was practically impossible to empanel an impartial jury.” Commonwealth v. Bonomi, supra at 333.
4. The Massachusetts wiretap statute. The defendant argues that the judge erred in failing to suppress9 the fruits of the Federal surveillance because he was not served with a complete copy of all the recordings thirty days prior to trial pursuant to G. L. c. 272, § 99 O 1 (1990 ed.) (discovery provision). Section 99 O 1 provides in pertinent part: “[I]n any criminal trial where the commonwealth intends to offer in evidence any portions of the contents of any interception or any evidence derived therefrom the defendant shall be served with a complete copy of each document and item which make up each application, renewal application, warrant, renewal order, and return pursuant to which the information was obtained.” If the defendant is not served with the [517]*517specified document and items, the intercepted communication and any evidence derived therefrom are rendered illegally obtained and are inadmissible. G. L. c. 272, § 99 P 1.
The defendant does not dispute that thirty days prior to trial he received copies of all the tapes the Commonwealth intended to use as evidence against him. Rather, the defendant argues that he is entitled to receive all the recordings made during the Federal surveillance as a condition precedent to the admission in evidence of any portion of the recordings. The defendant argues that § 99 O 1 applies to the surveillance conducted by the Federal government.
While we reserved our opinion on a similar issue in Commonwealth v. Picardi, 401 Mass. 1008 (1988), we now consider whether the discovery provision of the wiretap statute is applicable to interceptions made by the Federal government, authorized by order of a Federal court. We are persuaded that § 99 O 1 does not apply to such evidence. We interpret § 99 O 1 to apply only to evidence obtained pursuant to the application, warrant, renewal application, and return provisions of G. L. c. 272, § 99 F-M. Our conclusion follows from the statute which provides, “[T]he defendant shall be served with a complete copy of each document and item which make up each application, renewal application, warrant, renewal order, and return” (emphasis supplied). G. L. c. 272, § 99 O 1.
As the General Court defined each of the emphasized terms in c. 272, § 99 F-M, we assign the definition of each of the emphasized terms to § 99 O l.10 Thus, defendant is entitled to documents and items which comprise each application, renewal application, warrant, and return filed, issued, or requested pursuant to G. L. c. 272, § 99 F-M. As the [518]*518application in the present case was submitted, the warrant issued, the renewal granted, and return made pursuant to Federal law, it necessarily follows that the discovery provisions of the statute do not apply.11 See District Attorney for the Plymouth Dist. v. Coffey, 386 Mass. 218, 224-225 (1982). As the recordings were lawfully obtained under Federal law, we know of no basis under the statute which would entitle the defendant the automatic right to discover copies of all the recordings made during the Federal surveillance in circumstances where he had received discovery of all recordings which were to be offered in evidence. Accordingly, we find no error.
5. The admissibility of Zannino’s statements of April 3, 1981. During the trial, the Commonwealth presented evidence, in the form of a tape recording, of a conversation Ila-rio Zannino had with two associates on April 3, 1981. The essence of the conversation, drawn from the transcript of grand jury proceedings is presented in the margin.12 The defendant objected to Zannino’s statements as hearsay. The judge admitted Zannino’s statements as statements made by a joint venturer in furtherance of a joint enterprise. There was no error.
In Commonwealth v. Colon-Cruz, 408 Mass. 533, 543 (1990), quoting Commonwealth v. White, 370 Mass. 703, 708-709 (1976), we stated the well-settled rule that “out-of-[519]*519court statements by joint criminal venturers are admissible against the others if the statements are made ‘both during the pendency of the cooperative effort and in furtherance of its goal.’ ” This exception does not apply after the criminal enterprise has ended, see Commonwealth v. Drew, 397 Mass. 65, 71 (1986), but does apply where the joint venturers are acting to conceal the crime that formed the basis of the enterprise. See Commonwealth v. White, supra at 709-710 & n.8.
The defendant contends that the joint venture had ended at the time Zannino made the statements in issue. On this basis, the defendant argues that Zannino’s statements are unreliable hearsay. See Commonwealth v. Bongarzone, 390 Mass. 326, 340 (1983) (reliability derives from continuation of joint enterprise).
Efforts on the part of a joint venturer to conceal the occurrence of the enterprise’s unlawful purpose or to effect an escape warrant the inference that the joint venture continued through the time the statements were made. Commonwealth v. White, supra at 709-710. Absent a circumstance such as where the declarant had been incarcerated at the time the statement was made, as was the. case in Commonwealth v. Drew, supra at 71, or where the declarant has been apprehended before the statement had been made, as was the case [520]*520in Commonwealth v. Dahlstrom, 345 Mass. 130, 132 (1962), we cannot say that the joint venture had terminated at the time the statements were made. The relationship of the defendant and the declarant as revealed through conversations intercepted on March 12, 1981, and the circumstances in which the statements at issue were made, give us little difficulty concluding that the judge was within his discretion in ruling that there was “[a]n adequate probability of the existence of ... [a continuing] common venture . . . .” Commonwealth v. Bongarzone, supra at 340.
The defendant argues that Zannino made the statements only to boast or brag of the incident. The defendant’s argument that Zannino’s discourse was nothing more than bragging is untenable. The defendant and Zannino had previously discussed the “problem” that Patrizzi was causing them. Zannino stated he knew “what to do” on receipt of information revealing Patrizzi’s whereabouts. At an unknown point in time Patrizzi was killed. The defendant will not be heard to say that Zannino was not attempting to limit the flow of information concerning a situation he had previously discussed and which remained undiscovered at the time he made the statements in issue. Zannino’s statements may have been boastful but in this instance the boast masked a desire to conceal the fact of the killing and the identity of the killers. As this end served to benefit both Zannino and the defendant, this overlap of interests “tends in some degree to assure” that Zannino’s statements are minimally reliable. Id. Accordingly, there was no error.
6. Anonymous jury. We come now to the two interrelated errors committed at trial which require us to conclude that we must reverse the conviction and order a new trial. These errors involve the use of an anonymous jury, and, as will be explained, were compounded by the conduct of an examination by the trial judge of some members of the jury during the course of the trial in the absence of the prosecutor, defense counsel, and the defendant. The relevant facts pertaining to the empanelment of an anonymous jury are these.
[521]*521Prior to summoning the venire, the Commonwealth moved for empanelment of an anonymous jury. The Commonwealth argued that an anonymous jury was necessary as a precautionary measure “to insure that the jurors are free from intimidation, threats, or corrupt attempts to influence or purchase their votes.” The Commonwealth, however, did not seek to sequester the jury. Without written opinion, the motion judge granted the motion over the defendant’s objection.13
At the outset, the judge adopted the Commonwealth’s suggestion that jurors not be told of their anonymity to avoid the possibility that they would draw any adverse inference against the defendant. Thus, he gave no instruction to the jurors to draw no inference adverse to the defendant from the fact (then unknown to the jurors) of their anonymity. The judge did, however, authorize all prospective jurors to complete a six-page questionnaire pertaining to their background.14 Both parties used the responses to these questions to frame their voir dire inquiry and to exercise peremptory challenges. During voir dire the judge questioned each prospective juror and permitted both the Commonwealth and defense counsel an opportunity for further questioning.
[522]*522During the course of the trial, a court officer reported to the judge that several jurors had complained that the defendant was giving them the “whammy” or “evil eye.”15 Some of the jurors said they felt intimidated by the defendant and believed that he was writing down information about them. In response to this occurrence the judge interviewed each juror in chambers after discussing the matter with counsel. The purpose of the interviews was to learn of the reported conduct and assess the impartiality of the jurors. Each juror was interviewed individually. Neither the defense counsel nor the prosecutor was present during the interviews. The court stenographer was present during each interview and a transcript of the proceedings was made available to counsel immediately after the interviews.
During the course of the interviews, the judge discussed the alleged incident and told the jurors that he often sees defendants writing notes during trial and that the defendant’s actions could be explained given his interest in the proceedings. The judge also told most of the jurors that their identities were concealed as a matter of standard operating procedure in the Superior Court.16 The judge concluded each interview after determining that the juror being interviewed remained impartial given the circumstances. After concluding the interviews the judge reported to counsel that the matter was of “no consequence.”
[523]*523The defendant argues that the judge erred in granting the Commonwealth’s motion to empanel an anonymous jury. The defendant’s argument has three aspects. First, the defendant argues that empaneling an anonymous jury tainted the presumption of innocence, thereby infringing on his due process right to a fair trial. Second, the defendant argues that the complained-of procedure impaired his right to exercise his peremptory challenges, thereby infringing on his right to an impartial jury. Third, the defendant argues that the use of an anonymous jury violated G. L. c. 277, § 66 (1990 ed.),17 which provides: “A prisoner indicted for a crime punishable [524]*524with death or imprisonment for life, upon demand by him or his counsel upon the clerk, shall have a list of the jurors who have been returned. . . .”18 We agree that the defendant, charged as an accessory before the fact to murder in the first degree and punishable with life imprisonment without the possibility of parole, is a member of the class to whom the subject statute is addressed. The Commonwealth has cited no other capital cases in the nation where the defendant stood trial in front of an anonymous jury, and we have been unable to locate any. The Federal courts that have approved the use of an anonymous jury have expressly noted that “in capital cases, the law requires the disclosure of the names and addresses of prospective jurors . . . before trial. See 18 U.S.C. § 3432.” United States v. Scarfo, 850 F.2d 1015, 1023 (3d Cir.), cert. denied, 488 U.S. 910 (1988). In the Commonwealth, this rule is embodied in G. L. c. 277, § 66.
We conclude that the words “list of the jurors” in § 66 include prospective jurors’ names and addresses for several reasons. First, such construction accords with the plain meaning of these words. Next, the history of § 66 reveals that its drafters intended that jurors’ names be given to defendants in capital cases. Like its Federal counterpart — 18 U.S.C. § 3432 (1988) — § 66 is derived from the English practice of providing a list of jurors to the defendants in certain capital cases. Commonwealth v. Allen, 379 Mass. 564, 575 & n.4 (1980). In turn, this English practice was codified in a statute expressly requiring that these defendants receive “a list of the witnesses that shall be produced on the trial for proving the . . . indictment, and of the jury, mentioning the names, profession, and place of abode of the said witnesses and jurors” (emphasis added). Logan v. United States, 144 [525]*525U.S. 263, 305 (1892), quoting the statute of 7 Anne, c. 21, § 11.
Moreover, under established principles of statutory construction, we presume that the Legislature does not intend “to enact a barren and ineffective provision.” Insurance Rating Bd. v. Commissioner of Ins., 356 Mass. 184, 189 (1969). See O’Shea v. Holyoke, 345 Mass. 175, 179 (1962). To conclude that the information given to the defendant at trial was sufficient to comply with the mandate of § 66 would render this statute a virtual nullity because of the common law rule which is an inherent part of the law governing jury challenges. “Concomitant to the use of both peremptory challenges and challenges for cause must be the implied right to use reasonable means to gather information which will aid the parties in the intelligent exercise of challenges toward the constitutionally mandated goal of a fair and impartial jury.” Commonwealth v. Allen, supra at 577. See United States v. Barnes, 604 F.2d 121, 142 (2d Cir. 1979), cert. denied, 446 U.S. 907 (1980), citing Swain v. Alabama, 380 U.S. 202 (1965) (“A criminal defendant is entitled, under the law, to a fair and impartial jury. To be sure, there must be sufficient information elicited on voir dire to permit a defendant to intelligently exercise not only his challenges for cause, but also his peremptory challenges, the right to which has been specifically acknowledged by the Supreme Court . . .”).
There appears no doubt that the drafters of § 66 intended to give defendants charged with crimes punishable by death or imprisonment for life, or their counsel, the additional right to obtain the names and addresses of those who would sit in their judgment. The facts of the present case readily illustrate the rationale for this rule: trial counsel has complained that he was unable to determine whether he had had previous encounters with the son of a prospective juror who worked for the district attorney’s office, and with the husband of a prospective juror who worked as a police officer. While compelling reasons might justify withholding this information in other contexts, § 66 clearly mandates that the extreme nature of the punishment meted out in such cases [526]*526warrants the disclosure of the names and addresses of the jurors.19
Like its Federal counterpart, § 66 “is mandatory . . . and failure to allow defendant its benefits [is] plain error.” United States v. Crowell, 442 F.2d 346, 348 (5th Cir. 1971). See Logan, supra at 304 (“the words of the existing statute are too plain to be misunderstood”).20
Although the judge’s failure to follow the mandate of § 66 requires the reversal of the defendant’s conviction, we nonetheless discuss the defendant’s constitutional claims primarily because we deem it appropriate to outline the circumstances in which a trial judge may allow the empanelment of an anonymous jury. The need to give trial judges guidance in the future in regard to crimes not involving life imprisonment warrants this discussion. Thus, we address also the trial judge’s failure to handle the anonymous jury issue in accordance with the mandates of Federal constitutional law.
The Fourteenth Amendment to the United States Constitution embodies the notion, reaching back to Roman law, that a “shield of innocence surrounds a defendant on trial.” United States v. Thomas, 757 F.2d 1359, 1363, cert. denied sub nom. Fisher v. United States, 474 U.S. 819 (1985), citing Coffin v. United States, 156 U.S. 432, 453-454 (1895). [527]*527This so-called “presumption of innocence” is “a basic component of a fair trial under our system of criminal justice.” Estelle v. Williams, 425 U.S. 501, 503 (1976). In Estelle, the Supreme Court of the United States held that a State may not — consistent with the presumption of innocence — create trial conditions that affect the jurors’ perception of the defendant unless there is a substantial government interest in doing so. Id. at 505.
The empanelment of an anonymous jury triggers due process scrutiny because this practice is likely to taint the jurors’ opinion of the defendant, thereby burdening the presumption of innocence. Thomas, supra at 1364. See United States v. Vario, 943 F.2d 236, 239 (2d Cir. 1991), cert. denied, 112 S. Ct. 882 (1992); United States v. Tutino, 883 F.2d 1125, 1132 (2d Cir. 1989), cert. denied, 493 U.S. 1081 (1990); United States v. Scarfo, 850 F.2d 1015, 1023-1025 (3d Cir. 1988). The due process clause precludes the empanelment of an anonymous jury at a criminal trial unless anonymity is necessary to protect the jurors from harm or improper influence. See Thomas, supra at 1365. Henceforth, we shall require that no anonymous jury is to be empaneled in the courts of the Commonwealth unless the trial judge has first determined on adequate evidence that anonymity is truly necessary and has made written findings on the question. Further, the due process clause requires that reasonable precautions be taken to minimize the effect of the jurors’ anonymity on their perception of the defendant. Id. See Scarfo, supra at 1025.21
[528]*528Federal appellate courts have upheld various methods of minimizing the effect of anonymity on the jurors’ minds. Some trial judges chose to conceal the security reasons that prompted the court to withhold the jurors’ names. One trial judge, for instance, told the jurors that they would remain anonymous so as to prevent the media from interfering with their privacy. Thomas, supra at 1365 n.l. Other judges thought it best to reveal to the jurors that their anonymity was designed to protect them and their families from the possibility of harm or improper influence. These judges, however, added extensive instructions calculated to impress upon the jurors that no inference should be drawn with respect to the culpability of the defendant. See, e.g., Scarfo, supra at 1026-1028. No comparable curative instructions were given to the jury in this case at any time.
Under due process principles, if jurors become aware of their anonymity — as happened in the present case — the judge must take affirmative measures to protect the due process rights of the accused. The judge did not mention anonymity until certain jurors complained that the defendant was “giving them the evil eye.” At that time, the judge conducted individual conferences with the jurors.22 In the course [529]*529of these conferences, some of the jurors indicated that they already knew that their names had been withheld. On hearing this information, the judge did not inquire into the source of the jurors’ knowledge. Specifically, the judge did not attempt to ascertain whether the jurors had heard of their anonymity through the numerous newspaper reports that surrounded the trial.23 If that were the case, the jurors were likely to have been aware of the actual reason for their anonymity. They would, then, have inferred that the judge attempted to hide his belief that the defendant posed a threat to their safety when he made the (inaccurate) statement that anonymity is standard procedure. On these facts, it is evident that the judge did not handle the issue of the jurors’ anonymity with the reasonable care required by the due process clause.24
[530]*530Last, we hold that the judge also erred when he barred the defendant and his counsel from the voir dire that followed the “whammy” incident, thereby compounding the prejudice caused by the mishandling of the anonymous jury issue.25 “When a judge conducts an inquiry about a consequential matter, such as alleged serious misconduct of jurors, there is a requirement, deriving from the constitutional right of confrontation, that the defendant and his counsel be present.” Commonwealth v. Bobilin, 25 Mass. App. Ct. 410, 415 (1988), citing Commonwealth v. Robichaud, 358 Mass. 300, 301-303 (1970); Commonwealth v. Connor, 392 Mass. 838, 843 n.1 (1984); Commonwealth v. Doucette, 22 Mass. App. Ct. 659, 663-664 (1986), S.C., 400 Mass. 1005 (1987).26 While the trial judge may perform minor administrative formalities outside the presence of the defendant, see Commonwealth v. MacDonald (No. 1), 368 Mass. 395, 399 n.3 (1975), the judge may not bar the defendant from a voir dire during which jurors’ impartiality may be discussed. Robichaud, supra at 303.27 In the present case, the voir dire [531]*531was designed to ascertain whether the jurors could remain impartial after the trial incidents that had just occurred. Thus, notwithstanding the Commonwealth’s argument that the defendant’s presence might have been “counterproductive,” he had the right to attend that proceeding.28
For the reasons stated, the judgment is reversed, the verdict is set aside, and the case is remanded for retrial.
So ordered.