Spencer Tracy

James P. Curtayne

Pat O’Brien

Det. Vincent Ricks

Diana Lynn

Virginia 'Ginny' Curtayne

John Hodiak

District Attorney Louis Barra

Eduardo Ciannelli

Sol 'Knuckles' Lanzetta

James Arness

John Fordman 'Johnny' O'Hara

Jay C. Flippen

Sven Norson

William Campbell

Frank Korvac

Richard Anderson

Jeff Chapman

Arthur Shields

Mr. O'Hara

Louise Lorimer

Mrs. Peg O'Hara

Ann Doran

Betty Clark, Policewoman

Emile Meyer

Captain Tom Mulvaney

Regis Toomey

Fred Colton, Police Sound Man

Katherine Warren

Mrs. William Sheffield (as Katharine Warren)

Richard Bartlett

Tony Korvac (uncredited)

Brooks Benedict

Gambler (uncredited)

Charles Bronson

Angelo Korvac (uncredited)

Mae Clarke

Receptionist (uncredited)

Michael Tolan

Vincent Korvac (as Lawrence Tolan) (uncredited)

Peter Mamakos

James Korvac (uncredited)

Ned Glass

Preliminary Hearing Judge (uncredited)

Bill Fletcher

Pete Korvac (uncredited)

Jack Kruschen

Uniformed Detective (uncredited)

William Schallert

Intern with Ambulance (uncredited)