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)

Jan Merlin Tommy (uncredited)

Joe Ploski Convict (uncredited)

Stafford Repp Police Warden Machek (uncredited)

Harry Wilson Inmate Who Starts Fight (uncredited)