Ben Gazzara

Al Capone

Harry Guardino

Johnny Torrio

Sylvester Stallone

Frank Nitti

Susan Blakely

Iris Crawford

John Cassavetes

Frankie Yale

Frank Campanella

Big Jim Colosimo

John Orchard

Dion O'Banion

Carmen Argenziano

Jack McGurn

George Chandler

Robert E. Crowe

John Davis Chandler

Hymie Weiss

Royal Dano

Anton J. Cermak

Angelo Grisanti

Angelo Genna

Peter Maloney

Jake Guzik

Dick Miller

Joe Pryor

Robert Phillips

Bugs Moran

Martin Kove

Pete Gusenberg

Mario Gallo

Giuseppe Aiello

Russ Marin

Joseph Stenson

Tony Giorgio

Antonio Lombardo

John Martino

Tony Amatto

Don McGovern

N.Y. Cop #1

Redmond Gleeson

N.Y. Cop #2

John Finnegan

N.Y. Police Lt.

Vincent Barbi

Solly

James V. Christy

Thomas Bronk

Carmen Filpi

Waiter

John Howard

Warden J. Johnston

Beach Dickerson

Joe Kepka

Vincent Di Paolo

Mob Soldier (uncredited)