The defendant's argument, however, ignores the fact that the trial judge may appropriately rely on information beyond the scope of the evidence produced at trial, including information contained in the defendant's pre-sentence report and information obtained during the plea hearings of co-defendants, when imposing sentence. Cf. Serapo v. united States, 595 F.2d 3 (9th Cir. 1979) (Sentencing judge may consider information obtained from trials of co-defendants); United States v. Scalzo, 716 F.2d 463, 469 (7th Cir. 1983) (Reliance upon hearsay and other types of inadmissible information in assessing the factors affecting punishment is not per se improper); United States v. Cusenza, 749 F.2d 473, 478 (7th Cir. 1984) (Sentencing judge "may properly consider hearsay evidence of other criminal activity by the defendant, in some cases even if the defendant has pleaded not guilty to related charges."). The Supreme Court has repeatedly held that "a trial judge in the federal judicial system generally has wide discretion in determining what sentence to impose.