Eliot Ness
Robert Stack
Joe Fuselli
Keenan Wynn
Robert Osterloh
Paul Dubov
Abel Fernandez
Picco
Wolfe Barzell
Johnny Giannini
John Beradino
Brandy LaFrance
Barbara Nichols
Betty Anderson
Pat Crowley
Martin Flaherty
Bill Williams
George Ritchie
Joe Mantell
Frank Nitti
Bruce Gordon
Al Capone
Neville Brand
Peter Leeds
Eddie Firestone
Director
Phil Karlson
Producer
Quinn Martin
Music
Wilbur Hatch
Director of Photography
Charles Straumer
Editor
Robert L. Swanson
Art Direction
Ralph Berger
Frank T. Smith
Set Decoration
Sandy Grace
Writer
Paul Monash
Book
Oscar Fraley