Jason Robards
Role: Al Capone
George Segal
Role: Peter Gusenberg
Ralph Meeker
Role: George Clarence 'Bugs' Moran
Clint Ritchie
Role: Jack McGurn
Frank Silvera
Role: Nick Sorello
Joseph Campanella
Role: Albert Wienshank
Richard Bakalyan
Role: John Scalise
David Canary
Role: Frank Gusenberg
Bruce Dern
Role: Johnny May
Harold J. Stone
Role: Frank Nitti
Kurt Kreuger
Role: James Clark
Paul Richards
Role: Charles Fischetti
Joe Turkel
Role: Jake 'Greasy Thumb' Guzik
Milton Frome
Role: Adam Heyer
Mickey Deems
Role: Reinhold Schwimmer
John Agar
Role: Dion O'Bannion
Celia Lovsky
Role: Josephine Schwimmer
Tom Reese
Role: Ted Newberry
Jan Merlin
Role: Willie Marks
Alexander D'Arcy
Role: Joe Aiello
Reed Hadley
Role: Hymie Weiss
Charles Dierkop
Role: Salvanti
Tom Signorelli
Role: Bobo Borotto
Rico Cattani
Role: Albert Anselmi
Daniel Ades
Role: Angelo Molina (uncredited)
Vincent Barbi
Role: Witness (uncredited)
Laura Barry
Role: Girl (uncredited)
Bob Brandon
Role: Capone Board Member (uncredited)
Mushy Callahan
Role: Hood (uncredited)
Mary Grace Canfield
Role: Mrs. Doody, Landlady (uncredited)
Albert Cavens
Role: Reporter (uncredited)
Bud Cokes
Role: Hood (uncredited)
Russ Conway
Role: Interrogator (uncredited)
Yutta D'Arcy
Role: Gangster Girl (uncredited)
Tony Dante
Role: Commuter (uncredited)
Jack Del Rio
Role: Capone Board Member (uncredited)
George DeNormand
Role: Clerk (uncredited)
Paul Frees
Role: Narrator (voice) (uncredited)
Ron Gans
Role: Chapman (uncredited)
James Gonzalez
Role: Party Guest (uncredited)
Michele Guarini
Role: Patsy Lolordo (uncredited)
Phil Harron
Role: Capone Board Member (uncredited)
Jonathan Haze
Role: Gangster Dressed as a Cop (uncredited)
Lisa Jak
Role: Gangster Girl (uncredited)
Betsy Jones-Moreland
Role: Poolside Interviewer (uncredited)
Richard Krisher
Role: Desk Clerk (uncredited)
William Meader
Role: Tenant (uncredited)
Mary Michael
Role: Gangster Girl (uncredited)
Dick Miller
Role: Gangster Dressed as a Cop (uncredited)
Ernesto Molinari
Role: Capone Board Member (uncredited)
Barboura Morris
Role: Jeanette Landsman (uncredited)
Jack Nicholson
Role: Gino, Hit Man (uncredited)
Ron Nyman
Role: Hood (uncredited)
Monty O'Grady
Role: Party Guest (uncredited)
José Portugal
Role: Mourner (uncredited)
Leoda Richards
Role: Party Guest (uncredited)
Jerry Rush
Role: Party Guest (uncredited)
Jeffrey Sayre
Role: Party Guest (uncredited)
Ken Scott
Role: Policeman (uncredited)
Bernard Sell
Role: Hood (uncredited)
Sammy Shack
Role: Vagrant (uncredited)
Joan Shawlee
Role: Edna, Frank's Girlfriend (uncredited)
Buck Taylor
Role: Poolside Interviewer 2 (uncredited)
Corinna Tsopei
Role: Gangster Girl (uncredited)
Patrick Whyte
Role: Judge at Party (uncredited)
Judith Woodbury
Role: Party Guest (uncredited)