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Warren Duff (May 17, 1904 – August 5, 1973) was a film and television writer and producer. As a writer, Duff wrote for films including, Fashions of 1934, Angels with Dirty Faces (1938), Experiment Perilous (1944), Step Lively (1944), Chicago Deadline (1949), Appointment with Danger (1951) and The Turning Point (1952). He worked on television programs including The Rogues (1965), The Invaders (1967) and Mannix (1967). Wikipedia