According to Wikipedia: "Waldo Brian Donlevy was an American actor, noted for playing dangerous tough guys from the 1930s to the 1960s. He usually appeared in supporting roles. Among his best-known films are Beau Geste (1939), The Great McGinty (1940) and Wake Island (1942), in which he played the lead. For his role as Sergeant Markoff in Beau Geste, he was nominated for the Academy Award for Best Supporting Actor.
Donlevy starred as US special agent Steve Mitchell in the radio/TV series Dangerous Assignment. Mitchell received assignments to exotic locales involving international intrigue from the Commissioner, played by Herbert Butterfield.
Donlevy's obituary in The Times newspaper in the United Kingdom stated that "any consideration of the American 'film noir' of the 1940s would be incomplete without him"."