Broderick Crawford

Character: Rollo Lamar

Ralph Meeker

Character: Geraldo 'Jerry' Barker aka Iceman

Reed Hadley

Character: Special FBI Agent James Madden

William Talman

Character: William 'Machine Gun' Mason

Lon Chaney Jr.

Character: Leonard M. 'Alamo' Smith

Charles Bronson

Character: Benny Kelly

Felicia Farr

Character: Emily Euridice Evans

Roy Roberts

Character: Chief Ranger Will Erickson

Willis Bouchey

Character: Robertson Lambert

Peter J. Votrian

Character: Danny Lambert

Robert Bray

Character: Ranger McCormick

William Boyett

Character: Ranger at Park Exit (uncredited)

Nelson Leigh

Character: Madden's FBI Supervisor (uncredited)

Gregg Martell

Character: Accomplice on Fishing Boat (uncredited)

Bill McLean

Character: Dipsy (uncredited)

Jan Merlin

Character: Tommy (uncredited)

Joe Ploski

Character: Convict (uncredited)

Stafford Repp

Character: Police Warden Machek (uncredited)

Harry Wilson

Character: Inmate Who Starts Fight (uncredited)