James P. Curtayne
Spencer Tracy
Det. Vincent Ricks
Pat O’Brien
Mr. O'Hara
Arthur Shields
Mrs. Peg O'Hara
Louise Lorimer
Judge Keating
Henry O'Neill
Betty Clark, Policewoman
Ann Doran
Captain Tom Mulvaney
Emile Meyer
Fred Colton, Police Sound Man
Regis Toomey
Mrs. William Sheffield (as Katharine Warren)
Katherine Warren
Waiter (uncredited)
John Albright
Little Wolfie (uncredited)
Tony Barr
Tony Korvac (uncredited)
Richard Bartlett
Virginia 'Ginny' Curtayne
Diana Lynn
Gambler (uncredited)
Brooks Benedict
Harry (uncredited)
Leonard Bremen
Angelo Korvac (uncredited)
Charles Bronson
Receptionist (uncredited)
Mae Clarke
Vincent Korvac (as Lawrence Tolan) (uncredited)
Michael Tolan
James Korvac (uncredited)
Peter Mamakos
William Sheffield (uncredited)
Sailor Vincent
Preliminary Hearing Judge (uncredited)
Ned Glass
Pete Korvac (uncredited)
Bill Fletcher
Uniformed Detective (uncredited)
Jack Kruschen
District Attorney Louis Barra
John Hodiak
Intern with Ambulance (uncredited)
William Schallert
Sol 'Knuckles' Lanzetta
Eduardo Ciannelli
John Fordman 'Johnny' O'Hara
James Arness
Mrs. Katrina Lanzetta
Yvette Duguay
Sven Norson
Jay C. Flippen
Frank Korvac
William Campbell
Jeff Chapman
Richard Anderson
Director of Photography
John Alton
Director
John Sturges
Writer
John Monks Jr.
Novel
Eleazar Lipsky
Editor
Gene Ruggiero
Producer
William H. Wright
Original Music Composer
Carmen Dragon