"A wealthy society doctor decides to research the medical aspects of criminal behaviour by becoming one himself. He joins a gang of thieves and proceeds to wrest leadership of the gang away from it's extremely resentful leader."
Edward G. Robinson
as Dr. T.S. Clitterhouse
Claire Trevor
as Jo Keller
Humphrey Bogart
as 'Rocks' Valentine
Allen Jenkins
as Okay
Donald Crisp
as Police Inspector Lewis Lane
Gale Page
as Nurse Randolph
Henry O'Neill
as Judge
John Litel
as Mr. Monroe, Prosecuting Attorney
Thurston Hall
as Grant
Ward Bond
as Tug
Ronald Reagan
as Radio Announcer (voice) (uncredited)
Mary Field
as Millie - Mrs. Updyke's Maid (uncredited)
Maxie Rosenbloom
as Butch
Vladimir Sokoloff
as Popus
Bert Hanlon
as Pat
Curt Bois
as Rabbit
Billy Wayne
as Candy
Robert Homans
as Lt. Johnson
Irving Bacon
as Foreman of Jury
John Alban
as Guest (uncredited)
Frank Anthony
as Gambler in Room 920 (uncredited)
Wade Boteler
as Captain MacLevy (uncredited)
Sidney Bracey
as Police Chemist (uncredited)
John Breen
as Spectator at Robbery (uncredited)
Georgia Caine
as Mrs. Frederick R. Updyke (uncredited)
Romaine Callender
as Roberts - Updyke's Butler (uncredited)
Glen Cavender
as Alarm Company Clerk (uncredited)
Loia Cheaney
as Nurse Conner (uncredited)
Bud Cokes
as Courtroom Spectator (uncredited)
Hal Craig
as Detective Getting Rocks' Fingerprints (uncredited)
Ray Dawe
as Policeman (uncredited)
Hal K. Dawson
as Pedestrian at Burglary Site (uncredited)
Earl Dwire
as Surgeon (uncredited)
Frank Fanning
as Fingerprint Expert (uncredited)
J.C. Fowler
as Gambler (uncredited)
Edward Gargan
as Police Sergeant (uncredited)
William Haade
as Mrs. Updyke's Watchman (uncredited)
Winifred Harris
as Mrs. Ganswoort - Patient (uncredited)
John Harron
as Alarm Company Operator (uncredited)
Thomas E. Jackson
as Inspector Connors (uncredited)
Mike Lally
Vera Lewis
as Juror (uncredited)
Al Lloyd
as Sequin Hotel Desk Clerk (uncredited)
Bruce Mitchell
as Bailiff (uncredited)
Edmund Mortimer
Jack Mower
as Second Detective (uncredited)
Bob Reeves
Frank Reicher
as Professor O.J. Ludwig (uncredited)
Ky Robinson
as Third Detective (uncredited)
Ruth Robinson
as Updyke's Guest (uncredited)
Eric Stanley
as Dr. Ames (uncredited)
Larry Steers
Amzie Strickland
as Patient (uncredited)
Libby Taylor
as Mrs. Jefferson - Jo's Maid (uncredited)
Arthur Thalasso
as Forensic (uncredited)
Monte Vandergrift
as First Detective - with Earphones (uncredited)
Joyce Williams
as Patricia (uncredited)
Lawrence A. Williams
William Worthington
Anatole Litvak
Director
Barré Lyndon
Theatre Play
John Wexley
Screenplay
John Huston
Producer
Robert Lord
Gilbert Miller
Max Steiner
Original Music Composer
Tony Gaudio
Director of Photography
Warren Low
Editor
Hal B. Wallis
Executive Producer
Jack L. Warner
Carl Jules Weyl
Art Direction
Milo Anderson
Wardrobe Supervisor