KEARSE, Circuit Judge:
The United States seeks to appeal pursuant to 28 U.S.C. § 1291 (1976) from an order of the United States District Court for the Eastern District of New York, Thomas C. Platt, Jr., Judge, granting the motions of defendants Sam Goody, Inc. (“Goody”), and Samuel Stolon for a new trial after jury verdicts of guilty on charges of interstate transportation of stolen property in violation of 18 U.S.C. § 2314 (1976) and copyright infringement in violation of 17 U.S.C. § 506(a) (1976). Alternatively, the United States petitions pursuant to 28 U.S.C. § 1651 (1976) for a writ of mandamus directing the district court to reinstate the jury verdicts, enter judgment, and impose sentence. Because neither 28 U.S.C. § 1291 nor any other statutory provision authorizes an appeal by the government from an order granting a new trial in a criminal case, we dismiss the appeal for lack of appellate jurisdiction. Because we conclude that the circumstances of this case do not justify the granting of the extraordinary writ of mandamus, we deny the petition.
I. BACKGROUND
The pertinent facts may be summarized briefly. Goody operates a large chain of retail record stores in the New York City area. Stolon was its vice president in charge of procurement. Between June and [19]*19October, 1978, Goody purchased more than 100,000 counterfeit eight-track and cassette tapes, including thousands of copies of the original soundtracks from the films “Saturday Night Fever,” “Grease,” and “Thank God It’s Friday,” and of popular recordings such as “The Stranger” by Billy Joel, “Flowing Rivers” by Andy Gibb, and “Slow-hand” by Eric Clapton. Most of these counterfeit tapes allegedly were shipped by Goody to an affiliate in Minnesota. On the basis of these events and allegations, Goody and Stolon, along with Goody’s president, George Levy, were named as defendants in a sixteen-count indictment charging each of them with one count of racketeering in violation of 18 U.S.C. § 1962(c) (1976) (the “RICO count”1), three counts of interstate transportation of stolen property in violation of 18 U.S.C. § 2314 (the “transportation counts”), and twelve counts of copyright infringement in violation of 17 U.S.C. § 506(a) (the “copyright counts”).
The trial of the ease lasted approximately one month. At the conclusion of the government’s case, the court entered judgments of acquittal in favor of Goody on the RICO count and six of the copyright counts, in favor of Stolon on the same six copyright counts, and in favor of Levy on all counts. After the close of all the evidence, Goody and Stolon moved to dismiss the remaining counts; the court denied these motions, leaving for submission to the jury the three transportation counts and six copyright counts against Goody, and the same three transportation counts and six copyright counts, plus the RICO count, against Stolon. The jury found Goody guilty on two transportation counts and three copyright counts and acquitted it on the remaining transportation count and three copyright counts. The jury found Stolon guilty on one transportation count and one copyright count and acquitted him on the RICO count, two transportation counts, and five copyright counts.
Each defendant moved, pursuant to Fed. R.Crim.P. 29, for a judgment of acquittal on the counts on which he or it had been found guilty, and moved alternatively, pursuant to Fed.R.Crim.P. 33, for a new trial. In an opinion reported at 518 F.Supp. 1223, familiarity with which is assumed, the court denied the motions for acquittal on the ground that the evidence, viewed in the light most favorable to the government, was sufficient to allow reasonable jurors to find each defendant guilty beyond a reasonable doubt. Id. at 1224. Nevertheless, the court granted the motions for a new trial “in the interest of justice,” Fed.R.Crim.P. 33, because of the cumulative effect of three factors. First, the court found that the evidence of interstate transportation of the stolen goods was “slim” and that there was a “distinct risk” that the jury had been improperly influenced by the allegations of the RICO count. 518 F.Supp. at 1225. Second, the court accused the government of improperly delaying the correction of what the court characterized as the “false testimony” of an FBI agent who appeared as a government witness, id. at 1225-26, and found that there was a strong possibility that this “false testimony,” which was “before the jury for a long period of time,” might have influenced the jury’s consideration of the rest of the evidence, id. at 1226. 2 [20]*20Third, the court thought it possible that the various unproven charges might have had a “cumulative adverse [ejffect . . . upon the jurors’ deliberations.” Id. at 1225. The court “believe[d] that there was substantial prejudice suffered by the defendants here as a result of the factors enumerated above,” id. at 1226, and concluded that it must “exercise its discretion to order a new trial in the interests of justice,” id. at 1225.
The government filed its notice of appeal under 28 U.S.C. § 1291, seeking reversal of the order granting a new trial. Thereafter, recognizing that § 1291 may be inapplicable, the government petitioned for a writ of mandamus under 28 U.S.C. § 1651, ordering the district court to reinstate the guilty verdicts and to enter judgments thereon. We conclude that § 1291 does not authorize the present appeal and that the circumstances do not warrant issuance of mandamus.
II. APPELLATE JURISDICTION
Section 1291 provides, in relevant part, that “[t]he courts of appeals shall have jurisdiction of appeals from all final decisions of the district courts of the United States....” A final judgment or order is one that conclusively determines the rights of the parties to the litigation, leaving nothing for the court to do but execute the order. See Coopers & Lybrand v. Livesay, 437 U.S. 463, 467, 98 S.Ct. 2454, 2457, 57 L.Ed.2d 351 (1978). “ ‘[T]he final judgment rule is the dominant rule in federal appellate practice,’ ” DiBella v. United States, 369 U.S. 121, 126, 82 S.Ct. 654, 657, 7 L.Ed.2d 614 (1962), quoting 6 Moore, Federal Practice 113 (2d ed. 1953), and is designed to prevent the parties from taking piecemeal appeals, leading to judicial inefficiency and unnecessary delay of the conclusion of the litigation.
An order granting a new trial has none of the earmarks of a final decision. It settles no rights between the parties, but instead initiates a new proceeding to determine those rights. Accordingly, such orders have almost uniformly been held interlocutory,3 and hence nonappealable, both in civil cases, see, e.g., Allied Chemical Corp. v. Daiflon, Inc., 449 U.S. 33, 34, 101 S.Ct. 188, 190, 66 L.Ed.2d 193 (1980), and in criminal cases, United States v. Hitchmon, 602 F.2d 689, [21]*21692-93 (5th Cir. 1979) (en banc); United States v. Taylor, 544 F.2d 347, 349 (8th Cir. 1976) (“[Courts of appeal will entertain appeals only from final judgment and . .. an order granting a new trial is not a final judgment.”); 15 C. Wright, A. Miller & E. Cooper, Federal Practice and Procedure § 3919, at 331 (Supp.1982) (“An order that merely grants a new trial ... is not subject to appeal by the government . ...”).
The final judgment requirement is not entirely inflexible, having been tempered by certain exceptions. The principal judge-made exception, articulated by the Supreme Court in Cohen v. Beneficial Industrial Loan Corp., 337 U.S. 541, 69 S.Ct. 1221, 93 L.Ed. 1528 (1949), is known as the “collateral order” doctrine. Under that doctrine, a small class of orders “which finally determine claims of right separable from, and collateral to, rights asserted in the action,” and which are too important and too independent of the cause itself to be denied immediate review, may be appealed under § 1291 before final judgment is entered. Id. at 546, 69 S.Ct. at 1225. The government contends that the new-trial order in the present case is a collateral order within the meaning of the Cohen doctrine.
The Cohen doctrine does have some applicability to criminal cases, Carroll v. United States, 354 U.S. 394, 403-04, 77 S.Ct. 1332, 1338, 1 L.Ed.2d 1442 (1957) (dictum), for although Cohen itself was a civil ease, it construed § 1291, which by its terms applies to “all final decisions of the district courts” without differentiation between civil cases and criminal prosecutions. See Arizona v. Manypenny, 451 U.S. 232, 244-45, 101 S.Ct. 1657, 1665-66, 68 L.Ed.2d 58 (1981); Abney v. United States, 431 U.S. 651, 659 n.4, 97 S.Ct. 2034, 2040 n.4, 52 L.Ed.2d 651 (1977). The teaching of the Supreme Court, however, is that interlocutory orders “relating to a criminal case [that] may be found to possess sufficient independence from the main course of the prosecution to warrant treatment as plenary orders .... are very few.” Carroll v. United States, supra, 354 U.S. at 403, 77 S.Ct. at 1338. Thus, the Carroll Court noted only one prior Supreme Court decision expressly applying the Cohen reasoning to a criminal case, to wit, Stack v. Boyle, 342 U.S. 1, 6, 72 S.Ct. 1, 4, 96 L.Ed. 3 (1951), which held that an order relating to the amount of bail to be exacted was a final collateral order. In addition, the Carroll Court said that
[e]arlier cases illustrated, sometimes without discussion, that under certain conditions orders for the suppression or return of illegally seized property are appealable at once, as where the motion is made prior to indictment, or in a different district from that in which the trial will occur, or after dismissal of the case, or perhaps where the emphasis is on the return of property rather than its suppression as evidence.
354 U.S. at 403-04, 77 S.Ct. at 1338 (emphasis in original; footnotes omitted). More recently, the Court has applied the collateral order doctrine to allow a defendant to appeal immediately an order rejecting his claim that a trial would subject him to double jeopardy in violation of his constitutional rights. Abney v. United States, supra. The courts of appeals, in applying the Cohen-Carroll principle, have permitted government appeals under § 1291 from certain types of sentencing decisions, e.g., United States v. Busic, 592 F.2d 13, 25-26 (2d Cir. 1978); see United States v. United States District Court, 645 F.2d 7 (6th Cir. 1981) (denying mandamus because appeal available under § 1291); United States v. United States District Court, 601 F.2d 379, 380 (9th Cir. 1979) (same), from an order disqualifying the entire United States Attorney’s office in a pending prosecution, United States v. Caggiano, 660 F.2d 184, 189-90 (6th Cir. 1981), and from an order appointing a special prosecutor to pursue a prosecution whose dismissal had been sought by the government, United States v. Cowan, 524 F.2d 504, 507 (5th Cir. 1975), cert. denied, 425 U.S. 971, 96 S.Ct. 2168, 48 L.Ed.2d 795 (1976).
So far as we can determine, however, every court presented with the question has viewed an order granting a new trial as not sufficiently final or collateral to [22]*22give a right of appeal under the principles of Cohen and Carroll. We share that view. In the present case, the trial judge ordered a new trial “in the interest of justice,” Fed.R.Crim.P. 33, because he believed it possible that the jury, which had before it legally sufficient evidence to support the defendants’ convictions, might have reached its verdicts of guilty because of factors other than that evidence, namely the presence of the RICO count, the presence of the other unproven charges, and the effect of what the judge called “false testimony” that was belatedly corrected. Such an order for a new trial can hardly be considered “independen[t] from the main course of the prosecution,” Carroll v. United States, 354 U.S. at 403, 77 S.Ct. at 1338, for it focused squarely on the course of that prosecution and determined that the prosecution must be repeated. Nor does the order determine an important claim of right with any sort of finality, for the disputed substantive question was not, as the government would frame it, whether the defendants should have a new trial, but rather whether the jury would have found the defendants guilty absent the prejudicial factors cited by the trial judge. The new-trial order does not answer the substantive question but only starts the process by which it may be answered. Hence we conclude that the order granting Goody and Stolon a new trial was not a final collateral order within the meaning of Cohen and Carroll.
The government argues persuasively that some of the factors that militate against our entertaining appeals from new-trial orders in other circumstances do not pertain here. Here, for example, the desire to avoid piecemeal appeals is not a consideration since there can be no review of this new-trial order after a final judgment is entered: if the new trial results in a conviction, the propriety of the new-trial order will have become moot; and if the new trial results in an acquittal, the government will be precluded from appealing because of the Double Jeopardy Clause, e.g., United States v. Martin Linen Supply Co., 430 U.S. 564, 571, 97 S.Ct. 1349, 1354, 51 L.Ed.2d 642 (1977) (“Perhaps the most fundamental rule in the history of double jeopardy jurisprudence has been that ‘[a] verdict of acquittal ... could not be reviewed . .. without putting [a defendant] twice in jeopardy, and thereby violating the Constitution, quoting United States v. Ball, 163 U.S. 662, 671, 16 S.Ct. 1192, 1195, 41 L.Ed. 300 (1896).’ ”) Hence, the policy against piecemeal appeals is not a factor.
Nor are we concerned in the present circumstances with double jeopardy restrictions on the government’s right to appeal in a criminal case. Since the jury had rendered verdicts of guilty, the government does not seek to put the defendants through the ordeal of a repeated prosecution; the appeal, if sustained, would simply require the reinstatement of the verdicts already obtained. In United States v. Wilson, 420 U.S. 332, 336, 95 S.Ct. 1013, 1018, 43 L.Ed.2d 232 (1975), the Supreme Court, in allowing a government appeal under 18 U.S.C. § 3731 (1976)4 from a judgment of acquittal entered after a jury verdict of guilty, stated that “the constitutional protection against Government appeals attaches only where there is a danger of subjecting the defendant to a second trial for the same offense . .. . ” In Martin Linen Supply Co., supra, the Court stated similarly that “where a Government appeal presents no threat of successive prosecutions, the Dou[23]*23ble Jeopardy Clause is not offended/ U.S. at 569-70, 97 S.Ct. at 1353-54. Thus, if we had jurisdiction of the government’s appeal, the Double Jeopardy Clause would not bar a reversal and the consequent reinstatement of the jury’s verdicts. 430
The government also points out that Congress has expressed a policy favoring appeals by the government in criminal cases to the extent permitted by the Double Jeopardy Clause (Government’s brief on appeal at 52). This policy is spelled out in § 3731 as amended in 1970, see note 4 supra, which governs most appeals by the government in criminal cases. That section, however, makes appealable only orders of the district court that dismiss an indictment or otherwise terminate the prosecution, e.g., United States v. Wilson, supra, 420 U.S. at 337-38, 95 S.Ct. at 1018-19, or orders that suppress or exclude evidence,5 e.g., United States v. Helstoski, 442 U.S. 477, 487 n.6, 99 S.Ct. 2432, 2439 n.6, 61 L.Ed.2d 12 (1979). There is no suggestion either in the language of § 3731, or in the legislative history, or in the cases construing the section, that Congress’s broadening of the government’s right to appeal was intended to permit appeal of nonsuppression-type orders that did not terminate the prosecution. See United States v. Wilson, supra, 420 U.S. at 338, 95 S.Ct. at 1019; Conference Report, H.R.Rep. No.1768, 91st Cong., 2d Sess. 21 (1970), reprinted in [1970] U.S.Code Cong. & Ad. News 5842, 5848; 15 C. Wright, A. Miller & E. Cooper, Federal Practice and Procedure § 3919, at 331 (Supp.1982) (“The right of the government to appeal from an order that dismisses an indictment or information is subject to at least some of the constraints of the final judgment requirement.”). Thus, § 3731 does not, as the government here concedes, make appealable an order granting a new trial. United States v. Alberti, 568 F.2d 617, 620-21 (2d Cir. 1977);6 United States v. Taylor, supra.
The same considerations that have led the courts to avoid construing § 3731 broadly as authorizing appeals from new-trial orders lead us to eschew expansion of the traditional scope of § 1291 to allow the present appeal. It has long been established that appeals by the government in criminal cases are not favored and are permitted only if expressly authorized by statute. E.g., Arizona v. Manypenny, supra, 451 U.S. at 245, 101 S.Ct. at 1665-66; United States v. Martin Linen Supply Co., supra, 430 U.S. at 568, 97 S.Ct. at 1352 (“United States cannot appeal in a criminal case without express congressional authorization.”); United States v. Wilson, supra, 420 U.S. at 336, 95 S.Ct. at 1018 (“Government [can]not take an appeal in a criminal case without express statutory authority.”); United States v. Sanges, 144 U.S. 310, 311-23, 12 S.Ct. 609, 609-15, 36 L.Ed. 445 (1892). As the Court stated in Carroll v. United States, supra,
[24]*24appeals by the Government in criminal cases are something unusual, exceptional, not favored. The history [of federal appellate jurisdiction] shows resistance of the Court to the opening of an appellate route for the Government until it was plainly provided by the Congress, and after that a close restriction of its uses to those authorized by the statute.
354 U.S. at 400, 77 S.Ct. at 1336. This historic policy disfavoring government appeals in criminal cases, which has repeatedly been reaffirmed by the Court concurrently with its recognition of Congress’s increasing allowance of interlocutory appeals, has a prudential basis, “over and above the constitutional protection against double jeopardy,” DiBella v. United States, supra, 369 U.S. at 130, 82 S.Ct. at 660. The principal prudential bases are the avoidance of undue delay, see Carroll v. United States, supra, 354 U.S. at 415, 77 S.Ct. at 1344 (“Delays in the prosecution of criminal cases are numerous and lengthy enough without sanctioning appeals that are not plainly authorized by statute.”), and the avoidance of harassment, see Arizona v. Manypenny, in which the Court stated:
The need to restrict appeals by the prosecutor reflected a prudential concern that individuals should be free from the harassment and vexation of unbounded litigation by the sovereign. ... This concern also underlies the constitutional ban against double jeopardy, which bars an appeal by the prosecutor following a jury verdict of acquittal.... In general, both concerns translate into the presumption that the prosecution lacks appellate authority absent express legislative authorization to the contrary.
451 U.S. at 246, 101 S.Ct. at 1666 (citations omitted). Finding no express authority in § 1291 authorizing government appeals in criminal cases, and viewing the new-trial order as a nondispositive part of the main stream of the prosecution, we decline to construe § 1291, or the Cohen-Carroll exception, so broadly as to give us jurisdiction in the present case.
We are mindful of the fact that if the new-trial order is not reviewed by interlocutory appeal it will never be subject to review. This circumstance may well be unfortunate, for if the new-trial order was an abuse of the trial court’s discretion the public will have been forced needlessly to bear the cost of an expensive and time-consuming new trial; and, indeed, because of the passage of time, the government may be unable again to assemble the live proof needed to obtain a new conviction. The fact that review may never be available, however, has been deemed insufficient to require appellate courts to review an order that is plainly interlocutory. In Carroll v. United States, supra, the Supreme Court recognized that
[m]any interlocutory decisions of a trial court may be of grave importance to a litigant, yet are not amenable to appeal at the time entered, and some are never satisfactorily reviewable. In particular is this true of the Government in a criminal case, for there is no authority today for interlocutory appeals, and even if the Government had a general right to review upon an adverse conclusion of a case after trial, much of what it might complain of would have been swallowed up in the sanctity of the jury’s verdict.
354 U.S. at 406, 77 S.Ct. at 1339 (footnotes omitted). Similarly, in DiBella v. United States, supra, the Court stated as follows:
Nor are the considerations against appealability made less compelling as to orders granting motions to suppress, by the fact that the Government has no later right to appeal when and if the loss of evidence forces dismissal of its case.... [T]he Government is no more disadvantaged than in the case of an adverse ruling on the evidence during trial.... What disadvantage there be springs from the historic policy, over and above the constitutional protection against double jeopardy, that denies the Government the right of appeal in criminal cases save as expressly authorized by statute.... No such expression appears in ... § 1291, and the Government’s only right of appeal, given by ... § 3731, is confined to [25]*25narrowly defined situations not relevant to our problem. Allowance of any further right must be sought from Congress and not this Court.
369 U.S. at 130, 82 S.Ct. at 659-60 (citations omitted).
We conclude, therefore, that the fundamental policy expressed in § 1291 against appeals of nonfinal orders, reinforced by the long-established prudential policy barring government appeals in criminal cases absent express statutory authority, precludes our expansion of the Cohen doctrine in order to entertain this appeal from the order granting a new trial. We echo the analogous words of the Court in Carroll v. United States, that
[i]f there is serious need for appeals by the Government from [orders granting new trials], or unfairness to the interests of effective criminal law enforcement ... it is the function of Congress to decide whether to initiate a departure from the historical pattern of restricted appellate jurisdiction in criminal cases.
354 U.S. at 407, 77 S.Ct. at 1340 (footnote omitted).
The appeal is dismissed for want of appellate jurisdiction.
III. MANDAMUS
The extraordinary writ of mandamus is a drastic remedy reserved for exceptional circumstances. Its extraordinary character is illustrated in part by the fact that the writ will not be granted if a direct appeal is available, see Helstoski v. Meanor, 442 U.S. 500, 99 S.Ct. 2445, 61 L.Ed.2d 30 (1979); Kerr v. United States District Court, 426 U.S. 394, 403, 96 S.Ct. 2119, 2124, 48 L.Ed.2d 725 (1876); Ex parte Rowland, 104 U.S. 604, 617, 26 L.Ed. 861 (1882), and the fact that it will not be granted simply because review is sought of an order that is not appealable, see Will v. United States, 389 U.S. 90, 96-97, 104, 88 S.Ct. 269, 274, 278, 19 L.Ed.2d 305 (1967); United States v. Margiotta, 662 F.2d 131, 134 n.8 (2d Cir. 1981). The latter fact was discussed at some length in Will, in which the Supreme Court vacated a mandamus granted by the court of appeals that forbade the district court to require the government to supply a bill of particulars in a criminal case:
All our jurisprudence is strongly colored by the notion that appellate review should be postponed, except in certain narrowly defined circumstances, until after final judgment has been rendered by the trial court.... This general policy against piecemeal appeals takes on added weight in criminal cases, where the defendant is entitled to a speedy resolution of the charges against him. . . . Moreover, “in the federal jurisprudence, at least, appeals by the Government in criminal cases are something unusual, exceptional, not favored,” Carroll v. United States, 354 U.S. 394, 400 [77 S.Ct. 1332, 1336, 1 L.Ed.2d 1442] (1957), at least in part because they always threaten to offend the policies behind the double-jeopardy prohibition, cf. Fong Foo v. United States, 369 U.S. 141 [82 S.Ct. 671, 7 L.Ed.2d 629] (1962)-.. .. Mandamus, of course, may never be employed as a substitute for appeal in derogation of these clear policies.
389 U.S. at 96-97, 88 S.Ct. at 274 (citations omitted). The Will Court observed that although mandamus had properly issued to review certain types of orders in criminal cases, id. at 97-98, 88 S.Ct. at 274-75, the Court had “never approved the use of the writ to review an interlocutory procedural order in a criminal case which did not have the effect of a dismissal,” id. at 98, 88 S.Ct. at 275, and it noted that the fact that the government has no right to appeal from a final judgment in a criminal prosecution does not make the case for mandamus review any more compelling, id. at 97, 88 S.Ct. at 274. The writ thus is not to be granted merely because it is the only way in which the district court’s new-trial order might be reviewed. Rather, extraordinary circumstances must be shown.
Traditionally the writ of mandamus has been “used in the federal courts only ‘to confine an inferior court to a lawful exercise of its prescribed jurisdiction or to compel it to exercise its authority when it is its [26]*26duty to do so.’ ” Will v. United States, supra, 389 U.S. at 95, 88 S.Ct. at 273, quoting Roche v. Evaporated Milk Association, 319 U.S. 21, 26, 63 S.Ct. 938, 941, 87 L.Ed. 1185 (1943). The party seeking issuance of the writ has the “burden of showing that its right to issuance of the writ is ‘clear and indisputable,’ ” Bankers Life & Casualty Co. v. Holland, 346 U.S. 379, 384, 74 S.Ct. 145, 148, 98 L.Ed. 106 (1953), quoting United States v. Duell, 172 U.S. 576, 582, 19 S.Ct. 286, 287, 43 L.Ed. 559 (1899), and that the action or inaction of the district court has “amount[ed] to a judicial usurpation of power,” Allied Chemical Corp. v. Daiflon, Inc., supra, 449 U.S. at 35, 101 S.Ct. at 190. It is not sufficient that the decision have been wrong, e.g., id.; Will v. United States, supra, 389 U.S. at 98 n.6, 88 S.Ct. at 275 n.6, or even that it have been “grossly]” wrong, United States v. DiStefano, 464 F.2d 845, 850 (2d Cir. 1972), for
[mjandamus, it must be remembered, does not “run the gauntlet of reversible errors.” Bankers Life & Cas. Co. v. Holland [supra, 346 U.S. at 382, 74 S.Ct. at 147]. Its office is not to “control the decision of the trial court,” but rather merely to confine the lower court to the sphere of its discretionary power. Id. at 383 [74 S.Ct. at 148].
Will v. United States, supra, 389 U.S. at 104, 88 S.Ct. at 278.
The circumstances of the present case do not justify the granting of mandamus. There is no doubt that under Fed.R.Crim.P. 33 the district court had the power to grant a new trial in the interest of justice. The court clearly articulated its reasons for believing that the jury might have been influenced improperly to return guilty verdicts, and we see no respect in which the court disregarded any of the rules or standards governing the granting of new trials.7 We may disagree with the court’s characterization of the FBI agent’s initial testimony as “false” and with its view that the defendants were prejudiced by that testimony.8 And we may be less convinced than was the trial court of the possibility of prejudice from the presence of the RICO count, which the court dismissed as to Goody during the trial, and of which the jury acquitted Stolon.9 But we could [27]*27hardly say as a matter of law, in assessing whether the government had earned a “clear and indisputable” right to the guilty verdicts, that the defendants could not possibly have been prejudiced by the presence of the unproven charges. Thus, although we might not have ruled as the district judge did, we surely cannot say that he so clearly abused his discretion, in assessing what justice required, that the decision to grant a new trial constituted a usurpation of power.
The petition for a writ of mandamus is denied.