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

Joe De Nicola

Charles Fischetti

Angelo Grisanti

Angelo Genna

Peter Maloney

Jake Guzik

Dick Miller

Joe Pryor

Robert Phillips

Bugs Moran

Martin Kove

Pete Gusenberg

Mario Gallo

Giuseppe Aiello

George Milan

William H. Thompson

Russ Marin

Joseph Stenson

Tony Giorgio

Antonio Lombardo

John Martino

Tony Amatto

Bert Conway

Frank Loesch

Don Pulford

William Cooper

Pamela Toll

Mrs. Atkins

Eugenia Stewart

Miss Detwiller

Don McGovern

N.Y. Cop #1

Redmond Gleeson

N.Y. Cop #2

John Finnegan

N.Y. Police Lt.

Laurence Hagen

Samuel Ettelson

Tom Cook

Sam Volenta

Vincent Barbi

Solly

Tina Scala

Mrs. Torrio

James V. Christy

Thomas Bronk

Jack Ackerman

Adam Heyer

Ralph James

Judge J.H. Wilkerson

Carmen Filpi

Waiter

Jim Galante

John May

John Howard

Warden J. Johnston

Beach Dickerson

Joe Kepka

John C. Broderick

Maitre d'

Chuck Traynor

Senator

James R. Sweeney

Prison Doctor

George Engelson

Torrio's Doctor

Deborah Klose

Female Reporter

John Favorite

First Reporter

John Armond

Second Reporter

Jack O'Leary

Pool Hall Owner

Ben Marino

Frank Gusenberg

Vincent Di Paolo

Mob Soldier (uncredited)