Big House, U.S.A

Broderick Crawford

Rollo Lamar

Ralph Meeker

Geraldo 'Jerry' Barker aka Iceman

Reed Hadley

Special FBI Agent James Madden

William Talman

William 'Machine Gun' Mason

Lon Chaney Jr.

Leonard M. 'Alamo' Smith

Charles Bronson

Benny Kelly

Felicia Farr

Emily Euridice Evans

Roy Roberts

Chief Ranger Will Erickson

Willis Bouchey

Robertson Lambert

Peter J. Votrian

Danny Lambert

Robert Bray

Ranger McCormick

William Boyett

Ranger at Park Exit (uncredited)

Nelson Leigh

Madden's FBI Supervisor (uncredited)

Gregg Martell

Accomplice on Fishing Boat (uncredited)

Bill McLean

Dipsy (uncredited)