Al Capone
Johnny Torrio
Frank Nitti
Iris Crawford
Frankie Yale
Big Jim Colosimo
Dion O'Banion
Jack McGurn
Robert E. Crowe
Hymie Weiss
Anton J. Cermak
Charles Fischetti
Angelo Genna
Jake Guzik
Joe Pryor
Bugs Moran
Pete Gusenberg
Giuseppe Aiello
William H. Thompson
Joseph Stenson
Antonio Lombardo
Tony Amatto
Frank Loesch
William Cooper
Mrs. Atkins
Miss Detwiller
N.Y. Cop #1
N.Y. Cop #2
N.Y. Police Lt.
Samuel Ettelson
Sam Volenta
Solly
Mrs. Torrio
Thomas Bronk
Adam Heyer
Judge J.H. Wilkerson
Waiter
John May
Warden J. Johnston
Joe Kepka
Maitre d'
Senator
Prison Doctor
Torrio's Doctor
Female Reporter
First Reporter
Second Reporter
Pool Hall Owner
Frank Gusenberg
Mob Soldier (uncredited)