Indeed, the authorities seem to hold that evidence concerning the criminal conduct of an accused's codefendants, associates, or alleged accomplices is not prejudicial to the accused and that any error in the admission of such evidence is therefore harmless.Thomas v. United States, 162 F.2d 301, 303 (5th Cir. 1947) (in prosecution for violation of Marihuana Tax Act, admission of evidence of subsequent marihuana convictions of defendants' alleged supplier, who was not on trial, was not prejudicial); McGuire v. United States, 152 F.2d 577, 580 (8th Cir. 1945) (in Mann Act prosecution, evidence of relations between appellant's codefendants and prosecuting witnesses was not prejudicial to appellant); Grell v. United States, 112 F.2d 861, 873 (8th Cir. 1940) (in mail fraud prosecution, admission of testimony that reflected unfavorably on one defendant was not prejudicial to other defendants); Reeves v. State, 78 Ga. App. 126, 132, 50 S.E.2d 640, 644 (1948) (in separate prosecutions of two brothers for assault with intent to rape, error, if any, in admission of evidence concerning conduct of each defendant during other's absence was harmless because "* * * the jury in each case would necessarily understand that the defendant on trial was not connected with the conduct of the other brother which occurr