Al Capone

Jason Robards

Myrtle

Jean Hale

Peter Gusenberg

George Segal

George Clarence 'Bugs' Moran

Ralph Meeker

George Moran

Ralph Meeker

Jack McGurn

Clint Ritchie

Nick Sorello

Frank Silvera

Albert Wienshank

Joseph Campanella

John Scalise

Richard Bakalyan

Johnny May

Bruce Dern

Frank Gusenberg

David Canary

Frank Nitti

Harold J. Stone

James Clark

Kurt Kreuger

Adam Heyer

Milton Frome

Patsy Lolordo

Michele Guayini

Dion O'Bannion

John Agar

Hymie Weiss

Reed Hadley

Charles Fischetti

Paul Richards

Narrator

Paul H. Frees

Jake 'Greasy Thumb' Guzik

Joe Turkel

Joe Aiello

Alex D'Arcy

Adam Heyer

Milton Frome

Reinhold Schwimmer

Mickey Deems

Josephine Schwimmer

Celia Lovsky

Ted Newberry

Tom Reese

Willie Marks

Jan Merlin

Rio

Gus Trikonis

Salvanti

Charles Dierkop

Bobo Borotto

Tom Signorelli

Albert Anselmi

Rico Cattani

Diamond

Alex Rocco

Heitler

Leo Gordon

Angelo Molina (uncredited)

Daniel Ades

Witness (uncredited)

Vincent Barbi

Jeanette Landsman

Barboura Morris

Mrs. Doody

Mary Grace Canfield

Girl (uncredited)

Laura Barry

Capone Board Member (uncredited)

Nick Borgani

Desk Clerk

Richard Krisher

Capone Board Member (uncredited)

Bob Brandon

Hood (uncredited)

Mushy Callahan

Gino

Jack Nicholson

Chapman

Ron Gans

Reporter (uncredited)

Albert Cavens

Hood (uncredited)

Bud Cokes

Dale Van Sickel

Capone's Board Member

Jack Del Rio

Capone's Board Member

Phil Haran

Interrogator (uncredited)

Russ Conway

Capone's Board Member

Bob Brandin

Gangster Girl (uncredited)

Yutta D'Arcy

Capone's Board Member

Ernesto Moralli

Commuter (uncredited)

Tony Dante

Dick Miller

Clerk (uncredited)

George DeNormand

Policeman

Ken Scott

Edna

Joan Shawlee

Party Guest (uncredited)

James Gonzalez

Patsy Lolordo (uncredited)

Michele Guarini

Capone Board Member (uncredited)

Phil Harron

Gangster Dressed as a Cop (uncredited)

Jonathan Haze

Gangster Girl (uncredited)

Lisa Jak

Poolside Interviewer (uncredited)

Betsy Jones-Moreland

Jake Guzik

Joe Turkel

Director

Roger Corman