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
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
Charles Dierkop
Salvanti
Tom Signorelli
Bobo Borotto
Alex Rocco
Diamond
Leo Gordon
Heitler
Daniel Ades
Angelo Molina (uncredited)
Vincent Barbi
Witness (uncredited)
Mary Grace Canfield
Mrs. Doody, Landlady (uncredited)
Russ Conway
Interrogator (uncredited)
Paul Frees
Narrator (voice) (uncredited)
Jonathan Haze
Gangster Dressed as a Cop (uncredited)
Betsy Jones-Moreland
Poolside Interviewer (uncredited)
Mary Michael
Gangster Girl (uncredited)
Dick Miller
Gangster Dressed as a Cop (uncredited)
Barboura Morris
Jeanette Landsman (uncredited)
Jack Nicholson
Gino, Hit Man (uncredited)
Ron Nyman
Hood (uncredited)
Monty O'Grady
Party Guest (uncredited)
Leoda Richards
Party Guest (uncredited)
Jeffrey Sayre
Party Guest (uncredited)
Ken Scott
Policeman (uncredited)
Bernard Sell
Hood (uncredited)
Joan Shawlee
Edna, Frank's Girlfriend (uncredited)
Buck Taylor
Poolside Interviewer 2 (uncredited)
Corinna Tsopei
Gangster Girl (uncredited)
Mickey Deems
Reinhold Schwimmer
Gus Trikonis
Rio
Rico Cattani
Albert Anselmi
Laura Barry
Girl (uncredited)
Bob Brandon
Capone Board Member (uncredited)
Mushy Callahan
Hood (uncredited)
Albert Cavens
Reporter (uncredited)
Bud Cokes
Hood (uncredited)
Yutta D'Arcy
Gangster Girl (uncredited)
Tony Dante
Commuter (uncredited)
Jack Del Rio
Capone Board Member (uncredited)
George DeNormand
Clerk (uncredited)
Ron Gans
Chapman (uncredited)
James Gonzalez
Party Guest (uncredited)
Michele Guarini
Patsy Lolordo (uncredited)
Phil Harron
Capone Board Member (uncredited)
Lisa Jak
Gangster Girl (uncredited)
Richard Krisher
Desk Clerk (uncredited)
William Meader
Tenant (uncredited)
Ernesto Molinari
Capone Board Member (uncredited)
José Portugal
Mourner (uncredited)
Jerry Rush
Party Guest (uncredited)
Sammy Shack
Vagrant (uncredited)
Patrick Whyte
Judge at Party (uncredited)
Judith Woodbury
Party Guest (uncredited)
