In Glasser v. United States, the U.S. Supreme Court reverses the conviction of a defendant, Mr. Glasser, whose attorney, on the first day of trial, was also appointed to represent Mr. Kretske, a co-defendant. However, certain evidence that was favorable to Mr. Glasser’s defense incriminated Mr. Kretske. The Court rules that under those circumstances, their attorney could not put on the best defense possible for Mr. Glasser for fear of putting Mr. Kretske at risk of conviction. The Court concludes that Mr. Glasser’s Sixth Amendment right to counsel was violated.