Al Capone
Johnny Torrio
Iris Crawford
Frank Nitti
Frankie Yale
Big Jim Colosimo
Dion O'Banion
Jack McGurn
Robert E. Crowe
Hymie Weiss (as John D. Chandler)
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 (as Johnny Martino)
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 (as Vince Barbi)
Mrs. Torrio
Thomas Bronk (as James Christi)
Adam Heyer
Judge J.H. Wilkerson
Waiter
John May (as James Galante)
Warden J. Johnston
Joe Kepka
Maitre d' (as John Broderick)
Senator (as Howard Dale)
Prison Doctor (as James Sweeney)
Torrio's Doctor
Female Reporter
First Reporter
Second Reporter
Pool Hall Owner
Frank Gusenberg
Restaurant Patron (uncredited)
Extra (uncredited)
Mob Soldier (uncredited)
Pool Player (uncredited)
Chauffeur (uncredited)
Pedestrian (uncredited)
Convict (uncredited)