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