Henry Fonda, Jack Klugman, Lee J. Cobb, Ed Begley, John Fiedler, E.G. Marshall, Joseph Sweeney, and George Voskovec in 12 Angry Men (1957)
The jury got it wrong - the kid perpetrator from 12 Angry Men (1957) was in fact guilty, but they've found him innocent and then freed him. He would later go on to become a criminal mastermind, Keyser Soze.