The Life of a Gangster! I Mobster is directed by Roger Corman and adapted to screenplay by Steve Fisher from the novel written by Joseph Hilton Smyth. It stars Steve Cochran, Lita Milan, Robert Strauss, Celia Lovsky and John Brinkley. A CinemaScope production, music is by Gerald Fried and Edward L. Alperson Junior and cinematography by Floyd Crosby. Roger Corman was late in coming to the film noir/crime splinter of film making, but in 1958 he manufactured two very accomplished gangster pictures. Machine Gun Kelly starring Charles Bronson was something of a success, so it was hardly…