Horatio Gillingwater
Hugh Herbert
Lois Gillingwater
Patricia Ellis
Jim - Bank Robber
Sol Gorss
Lumpy - Bank Robber
Henry Otho
Lester - O'Bannion's Driver
Max Wagner
Sheriff Bert Hanson
Tom Brower
Wilbur - Detective
Milton Kibbee
Fred - Detective
Tom Wilson
Boy on Streetcar
Dickie Jones
Jerry Wayne
Warren Hull
Jacob 'Jake' Buckley
Hobart Cavanaugh
Evalina 'Evie' Gillingwater
Dorothy Vaughan
Jonathan Ramp
Clarence Wilson
Gangster Mugsy O'Bannion - aka Harold McCauley
Robert Gleckler
Alice Gillingwater
Mary Treen
Miss Perkins - Ramp's Secretary
Anne Nagel
Justice Felton
Arthur Aylesworth
Editor
Terry O. Morse
Executive Producer
Jack L. Warner
Hal B. Wallis
Screenplay
Dalton Trumbo
Director
Frank McDonald
Art Direction
Hugh Reticker
Director of Photography
George Barnes
Original Music Composer
Howard Jackson
Assistant Director
Russell Saunders
Tom Reed
Producer
Bryan Foy
Story
Martin Flavin