OPINION OF THE COURT
ROBERTS, Justice.
By order of October 28, 1971, the President Judge of the Court of Common Pleas of Philadelphia authorized a special judicial investigation into unethical conduct by members of the Philadelphia bar. In the course of this investigation appellants were called before an investigating judge who was to determine whether the evidence against them warranted institution of formal charges. The investigating judge concluded that formal charges were indicated.
Appellants were then tried before a three-judge special disciplinary court. The three-judge court found that appellants had engaged in unethical conduct, specifically, by soliciting negligence cases and submitting inflated medical cost reports. Accordingly, Silverberg, Levitan, and Oxman were ordered suspended from the practice of law for one, three, and five years respectively. The hearing court stayed the orders of suspension pending this appeal.1
At the formal disciplinary hearing, Oxman and Levitan testified in their own defense; they denied any wrongdoing. On cross-examination special counsel for the investigation was permitted to elicit that appel[111]*111lants had claimed the privilege against self-incrimination in the preliminary proceeding before the single investigating judge.2 These references to appellants’ exercise of their constitutional rights were allegedly designed only to impeach their credibility. We conclude that utilization, over objection,3 of appellant’s assertion of the [113]*113privilege against self-incrimination violated their rights under the Fifth Amendment to the United States Constitution 4 and article I, section 9 of the Pennsylvania Constitution P.S.5 The orders suspending appellants must be reversed6 and a new disciplinary hearing held.7
[114]*114In Grunewald v. United States, 353 U.S. 391, 77 S.Ct. 963, 1 L.Ed.2d 931 (1957), the United States Supreme Court faced the question before us today. Defendant Halperin was accused of corruptly influencing witnesses before a federal grand jury. When called before another grand jury, he declined to answer certain questions because his answers might incriminate him. At trial he answered the same questions in a way consistent with innocence. The government was permitted, over objection, to cross-examine Halperin on his allegedly inconsistent responses. The trial judge however indicated that this cross-examination could be considered only as reflecting on the witness’ credibility.8
The Supreme Court reversed. Justice Harlan, writing for the majority, noted that the practice of impeaching a witness’ credibility by bringing out a prior claim of the privilege against self-incrimination “has grave constitutional overtones.” 353 U.S. at 423, 77 S.Ct. at 983-984. Reversal, however, was based on the Court’s supervisory power. Id. at 424, 77 S.Ct. at 984. Two grounds for reversal were advanced. First, the Court, for the sake of argument, assumed that Halperin’s trial testimony and earlier claim of privilege were inconsistent. It then held that the potential for prejudice inherent in this cross-examination so far outweighed its probative value that the trial court in its sound discretion should not have permitted the questions. Id. at 420-421, 77 S.Ct. at 982.
[115]*115Second, examining the defendant’s testimony further, the Court concluded that the cross-examination was also improper because only prior inconsistent statements may be used to impeach. See 3A J. Wigmore, Evidence § 1040 (Chadbourn rev. 1970). Both the claim of privilege before the grand jury and the exculpatory answers at trial were “wholly consistent with innocence.” 353 U.S. at 421, 77 S.Ct. at 982. Therefore no inconsistency existed and impeachment should not have been permitted.
The concurring opinion of Justice Black, joined by then Chief Justice Warren, and Mr. Justice Douglas and Mr. Justice Brennan, addressed the constitutional issue directly.
“I agree with the Court that use of this claim of constitutional privilege to reflect upon Halperin’s credibility was error, but I do not, like the Court, rest my conclusion on the special circumstances of this case. I can think of no special circumstances that would justify use of a constitutional privilege to discredit or convict a person who asserts it. The value of constitutional privileges is largely destroyed if persons can be penalized for relying on them. It seems peculiarly incongruous and indefensible for courts which exist and act only under the Constitution to draw inferences of lack of honesty from invocation of a privilege deemed worthy of enshrinement in the Constitution.”
Id. at 425-426, 77 S.Ct.,at 984-985.
Since Gruneivald was decided, several courts have concluded that the reasoning of the concurring opinion, which, of course, was in no way contradicted by the majority’s failure to reach the constitutional issue, precludes cross-examination by reference to a prior claim of the privilege against self-incrimination. Fowle v. United States, 410 F.2d 48, 51-56 (9th Cir. 1969); Fagundes v. United States, 340 F.2d 673, 677-678 (1st Cir. 1965); Dean v. Commonwealth, 209 Va. 666, 166 S.E.2d 228 [116]*116(1969); State v. Greer, 17 Ariz.App. 162, 496 P.2d 152 (1972); People v. Jordan, 7 Mich.App. 28, 151 N.W.2d 242 (1967) ; State v. Martin, 84 N.M. 27, 498 P.2d 1370 (Ct.App.1972); Messier v. State, 428 P.2d 338 (Okl.Ct. Crim.App.1967) .9
Griffin v. California, 380 U.S. 609, 85 S.Ct. 1229, 14 L.Ed.2d 106 (1965), which held the fifth amendment to prohibit comment on a defendant’s silence, adopted the reasoning of the Grünewald concurring opinion.
“For comment on the refusal to testify is a remnant of the ‘inquisitorial system of criminal justice’ . which the Fifth Amendment outlaws. It is a penalty imposed by courts for exercising a constitutional privilege. It cuts down on the privilege by making its assertion costly.”
Griffin v. California, supra at 614, 85 S.Ct. at 1232-1233 (citations omitted). See Fowle v. United States, supra, 410 F.2d at 53; Dean v. Commonwealth, supra, 209 Va. at 670, 166 S.E.2d at 231; State v. Greer, supra, 17 Ariz.App. at 165, 496 P.2d at 155; cf. Commonwealth v. Haideman, 449 Pa. 367, 296 A.2d 765 (1972). See also Fagundes v. United States, supra; Messier v. State, supra. We agree that an accused’s constitutional right against self-incrimination is violated when a prior claim of the privilege against self-incrimination is introduced to impeach his credibility.10
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OPINION OF THE COURT
ROBERTS, Justice.
By order of October 28, 1971, the President Judge of the Court of Common Pleas of Philadelphia authorized a special judicial investigation into unethical conduct by members of the Philadelphia bar. In the course of this investigation appellants were called before an investigating judge who was to determine whether the evidence against them warranted institution of formal charges. The investigating judge concluded that formal charges were indicated.
Appellants were then tried before a three-judge special disciplinary court. The three-judge court found that appellants had engaged in unethical conduct, specifically, by soliciting negligence cases and submitting inflated medical cost reports. Accordingly, Silverberg, Levitan, and Oxman were ordered suspended from the practice of law for one, three, and five years respectively. The hearing court stayed the orders of suspension pending this appeal.1
At the formal disciplinary hearing, Oxman and Levitan testified in their own defense; they denied any wrongdoing. On cross-examination special counsel for the investigation was permitted to elicit that appel[111]*111lants had claimed the privilege against self-incrimination in the preliminary proceeding before the single investigating judge.2 These references to appellants’ exercise of their constitutional rights were allegedly designed only to impeach their credibility. We conclude that utilization, over objection,3 of appellant’s assertion of the [113]*113privilege against self-incrimination violated their rights under the Fifth Amendment to the United States Constitution 4 and article I, section 9 of the Pennsylvania Constitution P.S.5 The orders suspending appellants must be reversed6 and a new disciplinary hearing held.7
[114]*114In Grunewald v. United States, 353 U.S. 391, 77 S.Ct. 963, 1 L.Ed.2d 931 (1957), the United States Supreme Court faced the question before us today. Defendant Halperin was accused of corruptly influencing witnesses before a federal grand jury. When called before another grand jury, he declined to answer certain questions because his answers might incriminate him. At trial he answered the same questions in a way consistent with innocence. The government was permitted, over objection, to cross-examine Halperin on his allegedly inconsistent responses. The trial judge however indicated that this cross-examination could be considered only as reflecting on the witness’ credibility.8
The Supreme Court reversed. Justice Harlan, writing for the majority, noted that the practice of impeaching a witness’ credibility by bringing out a prior claim of the privilege against self-incrimination “has grave constitutional overtones.” 353 U.S. at 423, 77 S.Ct. at 983-984. Reversal, however, was based on the Court’s supervisory power. Id. at 424, 77 S.Ct. at 984. Two grounds for reversal were advanced. First, the Court, for the sake of argument, assumed that Halperin’s trial testimony and earlier claim of privilege were inconsistent. It then held that the potential for prejudice inherent in this cross-examination so far outweighed its probative value that the trial court in its sound discretion should not have permitted the questions. Id. at 420-421, 77 S.Ct. at 982.
[115]*115Second, examining the defendant’s testimony further, the Court concluded that the cross-examination was also improper because only prior inconsistent statements may be used to impeach. See 3A J. Wigmore, Evidence § 1040 (Chadbourn rev. 1970). Both the claim of privilege before the grand jury and the exculpatory answers at trial were “wholly consistent with innocence.” 353 U.S. at 421, 77 S.Ct. at 982. Therefore no inconsistency existed and impeachment should not have been permitted.
The concurring opinion of Justice Black, joined by then Chief Justice Warren, and Mr. Justice Douglas and Mr. Justice Brennan, addressed the constitutional issue directly.
“I agree with the Court that use of this claim of constitutional privilege to reflect upon Halperin’s credibility was error, but I do not, like the Court, rest my conclusion on the special circumstances of this case. I can think of no special circumstances that would justify use of a constitutional privilege to discredit or convict a person who asserts it. The value of constitutional privileges is largely destroyed if persons can be penalized for relying on them. It seems peculiarly incongruous and indefensible for courts which exist and act only under the Constitution to draw inferences of lack of honesty from invocation of a privilege deemed worthy of enshrinement in the Constitution.”
Id. at 425-426, 77 S.Ct.,at 984-985.
Since Gruneivald was decided, several courts have concluded that the reasoning of the concurring opinion, which, of course, was in no way contradicted by the majority’s failure to reach the constitutional issue, precludes cross-examination by reference to a prior claim of the privilege against self-incrimination. Fowle v. United States, 410 F.2d 48, 51-56 (9th Cir. 1969); Fagundes v. United States, 340 F.2d 673, 677-678 (1st Cir. 1965); Dean v. Commonwealth, 209 Va. 666, 166 S.E.2d 228 [116]*116(1969); State v. Greer, 17 Ariz.App. 162, 496 P.2d 152 (1972); People v. Jordan, 7 Mich.App. 28, 151 N.W.2d 242 (1967) ; State v. Martin, 84 N.M. 27, 498 P.2d 1370 (Ct.App.1972); Messier v. State, 428 P.2d 338 (Okl.Ct. Crim.App.1967) .9
Griffin v. California, 380 U.S. 609, 85 S.Ct. 1229, 14 L.Ed.2d 106 (1965), which held the fifth amendment to prohibit comment on a defendant’s silence, adopted the reasoning of the Grünewald concurring opinion.
“For comment on the refusal to testify is a remnant of the ‘inquisitorial system of criminal justice’ . which the Fifth Amendment outlaws. It is a penalty imposed by courts for exercising a constitutional privilege. It cuts down on the privilege by making its assertion costly.”
Griffin v. California, supra at 614, 85 S.Ct. at 1232-1233 (citations omitted). See Fowle v. United States, supra, 410 F.2d at 53; Dean v. Commonwealth, supra, 209 Va. at 670, 166 S.E.2d at 231; State v. Greer, supra, 17 Ariz.App. at 165, 496 P.2d at 155; cf. Commonwealth v. Haideman, 449 Pa. 367, 296 A.2d 765 (1972). See also Fagundes v. United States, supra; Messier v. State, supra. We agree that an accused’s constitutional right against self-incrimination is violated when a prior claim of the privilege against self-incrimination is introduced to impeach his credibility.10
[117]*117 It is elementary that a prior statement may be used to impeach a witness’ credibility only if that statement is in fact inconsistent with the witness’ testimony at trial. See 3A J. Wigmore, Evidence § 1040 (Chadbourn rev. 1970). It follows that when the three-judge court permitted the cross-examination in question it must necessarily have inferred that the prior claim of privilege was inconsistent with the later testimony of innocence.
The record does not establish that the three judges who sat as triers of fact in appellant»’ case directly attributed any indicia of guilt to the claims of privilege. But in finding the claims inconsistent with innocence and considering them to impeach appellants’ credibility the Court made a constitutionally impermissible inference. As this Court stated more than a century ago:
“If the privilege claimed by the witness be allowed the matter is at an end. The claim of privilege and its allowance is properly no part of the evidence submitted to the jury, and no inferences whatever can be legitimately drawn by them from the legal assertion by the witness of his constitutional right. The allowance of the privilege would be a mockery of justice, if either party is to be affected injuriously by it.”
Phelin v. Kenderdine, 20 Pa. 354, 363 (1853). See Johnson v. United States, 318 U.S. 189, 196-197, 63 S.Ct. 549, 553, 87 L.Ed. 704 (1943).
Appellants testified that they pleaded the privilege upon advice of counsel. Certainly a reasonable attorney could have many reasons other than concealing guilt for advising a client to claim the privilege at the investigato[118]*118ry stage of disciplinary proceedings. The preliminary proceedings were ex parte; appellants had no opportunity to cross-examine and thus had no means to explain possible exculpatory facts. See Grunewald v. United States, supra, 358 U.S. at 422, 77 S.Ct. at 983. “The privilege serves to protect the innocent who otherwise might be ensnared by ambiguous circumstances.” Slochower v. Board of Higher Education, 350 U.S. 551, 557-558, 76 S.Ct. 637, 641, 100 L.Ed. 692 (1956). See E. Griswold, The Fifth Amendment Today 9-30, 53-82 (1957).11
Just as an attorney may not be disciplined for invoking the privilege in a professional inquiry, Spevack v. Klein, 385 U.S. 511, 514-515, 87 S.Ct. 625, 627-628, 17 L.Ed.2d 574 (1967); Schlesinger Appeal, 404 Pa. 584, 614-616, 172 A.2d 835, 849-850 (1961), such invocation may not later be used to impeach his credibility when he asserts innocence. The “impeaching” cross-examination that was permitted here is “a penalty imposed by courts for exercising a constitutional privilege. It cuts down on the privilege by making its assertion costly.” Griffin v. California, 380 U.S. 609, 614, 85 S.Ct. 1229, 1232-1233, 14 L.Ed.2d 106 (1965); see Grunewald v. United States, 353 U.S. 391, 425-426, 77 S.Ct. 963, 984-985, 1 L.Ed.2d 931 (1957) (concurringopinion).
Here the loss of credibility suffered by appellants for claiming their rights was potentially devastating. Appellants’ defense rested heavily upon their testimony professing innocence. The impermissible impeachment of their credibility effectively neutralized the most important defense witnesses.
On this record we cannot say with assurance that the untáinted evidence alone, however persuasive, was sufficient to convince the trier of fact of appellants’ [119]*119guilt. The testimony of various witnesses was directly contrary to that of appellants. Credibility was crucial in the factfinder’s determination. The court explicitly stated that it chose to disbelieve appellants’ testimony.
Even though we may assume that the court attached no inference of guilt to the prior plea of privilege, we must conclude that use of the prior plea even to impeach was prejudicial to the defense. Therefore appellants are entitled to a new disciplinary hearing at which no use of their prior claim of the privilege against self-incrimination should be permitted.
Appellant Silverberg’s failure either to claim the privilege in the preliminary proceeding or to take the stand at the disciplinary hearing does not remove him from the ambit of our holding. This was a joint disciplinary hearing. Silverberg as much as either Oxman or Levitan rested his defense on their credibility. See United States v. Tomaiolo, 249 F.2d 683, 690-692 (2d Cir. 1957); State v. Boscia, 93 N.J.Super. 586, 600-602, 226 A.2d 643, 650-651 (App.Div.1967).
The evidence revealed that for two of the four years in question Silverberg was absent from the law office. The three-judge court found that Silverberg engaged in unethical conduct primarily on the theory that in a three-man office one lawyer could not be unaware of his partners’ activities. Silverberg, the court reasoned, though not directly involved in the firm’s personal injury cases, must have known of the conduct of his partners and “shared the ill-gotten gains.”
At the new disciplinary hearing, with Oxman’s and Levitan’s credibility unimpeached by their claim of privilege, they may be found not to have engaged in unethical conduct. Thus to now discipline Silverberg for his knowledge of conduct for which the principals may not be disciplined would be both illogical and unjust. We conclude that Silverberg should also have a new discipli[120]*120nary hearing because the unconstitutional cross-examination of witnesses appearing in his defense deprived him of a disciplinary hearing conducted in accordance with due process. Cf. In re Disbarment Proceedings, 321 Pa. 81,184 A. 59 (1936); State v. Boscia, supra.
The order of the special disciplinary court is reversed and the case remanded for further proceedings consistent with this opinion.
NIX, J., filed a concurring opinion in which ROBERTS, J., joins.
JONES, C. J., filed a dissenting opinion, in which POMEROY, J., joins.
POMEROY, J., filed a dissenting opinion, in which JONES, C. J., joins.