to offer contradiction, see Peoples v. United States, 5 Cir., 1965, 341 F.2d 60, cert. den. 380 U.S. 988, 85 S.Ct. 1362, 14 L.Ed.2d 280, we think such remarks are generally undesirable because the jury is likely to understand them in the former sense. However, the district court acted promptly, sua sponte, to counter any prejudice resulting from counsel’s argument. Fleming v. United States, 1 Cir., 1964, 332 F.2d 23.
Thereafter, government counsel proceeded to review the evidence against each defendant. In the course of referring to Kitchell, he stated,
“ there was a comment made by defense counsel, there is no evidence here that Mr. Kitchell knew of any of the other defendants. I submit to you it is an unfair comment. There are certain rules of evidence, his Honor will instruct you about, what the Government can introduce without prejudice to its case. I submit it is in that light you must consider that comment. There is no evidence to establish that Mr. Kitchell does not know — *
Toomey and Cabrera promptly objected. The court sustained the objection, called government counsel to the bench, and stated that he should make no further argument of that nature. Counsel then continued to discuss the evidence against Kitchell, and while so doing, stated,
“The issue is not, does he know these other defendants ? If that were the issue, we would bring in an entirely different set of witnesses.”
As soon as the argument was finished, all appellants objected to this statement.
Remarks on the availability of unused “evidence” are clearly impermissible. Ginsberg v. United States, 5 Cir., 1958, 257 F.2d 950; see United States v. Lefkowitz, 2 Cir., 1960, 284 F.2d 310, 314; cf. Greenberg v. United States, 1 Cir., 1960, 280 F.2d 472, 475. Conceivably a single error in this regard might have been cured by the court’s sustaining the objection. The government cannot go on, however, making such remarks and having the court strike them out, and then claim they had no effect. We think in this case the government’s conduct could have had but one effect, that of fixing the jury’s attention on the fact that Kitchell’s unnamed associates were the other defendants. Whether by negligence or design, the government did its best to bring in and emphasize the very evidence which these defendants had sought to avoid by their motions for severance, and which the court had carefully excluded. Where this possibility of prejudice existed, the government should have been particularly circumspect, instead of the opposite. We cannot sanction such improprieties. The potential for prejudice in this case is magnified by the fact that the admissible evidence we have outlined connecting various defendants other than Kitchell with the criminal enterprise, though sufficient to go to the jury, was in several instances fragmentary and not particularly strong.
The appellants other than Kitchell must be given a new trial. We include Cabrera in this because, although Cabrera was independently identified as having been with Kitchell in Vermont, this testimony was far less damaging than Kitchell’s specific statement, which, among other things, directly ascribed to Kitchell’s companion the buying of the pinchbar.
On the other hand, we are unwilling to say that Kitchell was prejudiced. The evidence naming his associates was not introduced against him, not because it did not exist, nor because it was inadmissible against him, but solely for the sake of the other defendants. Even if the government’s conduct led the jury fully to assume that the evidence existed, it did in fact exist, in the peculiar circumstances of this case, insofar as Kitchell was concerned.8
8
Although the situation might be different if we ordered judgment of acquittal for Kitchell’s co-defendants, see Herman v. United States, 5 Cir., 1961, 289 F.2d 362, 368, cert. den.
368 U.S. 897, 82 S.Ct. 174, 7 L.Ed.2d 93, Kitcheli’s conviction for *720conspiracy is not vitiated because they are entitled to a new trial. A single defendant can be indicted and convicted of conspiracy providing an unlawful agreement with others can be proved. Rogers v. United States, 1951, 340 U.S. 367, 375, 71 S.Ct. 438, 95 L.Ed. 344; see United States v. Gordon, 8 Cir., 1957, 242 F.2d 122, 125, cert. den. 354 U.S. 921, 77 S.Ct. 1378, 1 L.Ed.2d 1346.