In Brute Force Burt Lancaster plays a member of a close group of convicts who are terrorized by a napoleonic guard played by Hume Cronyn. Hume Cronyn to my mind will always be the nice old man from Batteries Not Included. Here he plays a sadist. Anyhow, by 1947 standards Brute Force is shockingly violent. Also, there is an inmate named Calypso who does much of his communicating via singing. Good movie.