Waldo Brian Donlevy (February 9, 1901 – April 6, 1972) was an American actor, who was noted for playing dangerous and tough characters. Usually appearing in supporting roles, among his best-known films are Beau Geste (1939), The Great McGinty (1940) and Wake Island (1942). For his role as the sadistic Sergeant Markoff in Beau Geste, he was nominated for the Academy Award for Best Supporting Actor.

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