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.
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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 as Gambler (uncredited)
Vera Lewis as Juror (uncredited)
Al Lloyd as Sequin Hotel Desk Clerk (uncredited)
Bruce Mitchell as Bailiff (uncredited)
Edmund Mortimer as Guest (uncredited)
Jack Mower as Second Detective (uncredited)
Bob Reeves as Policeman (uncredited)
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 as Guest (uncredited)
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)