Machine-Gun Kelly

Charles Bronson

George R. 'Machine Gun' Kelly

Susan Cabot

Florence 'Flo' Becker

Morey Amsterdam

Michael Fandango

Richard Devon

Apple

Jack Lambert

Howard

Frank De Kova

Harry

Connie Gilchrist

'Ma' Becker

Wally Campo

Maize

Barboura Morris

Lynn Grayson

Lori Martin

Sherryl Vito

George Archambeault

Frank

Robert Griffin

Mr. Andrew Vito

Michael Fox

Detective Clinton

Mitzi McCall

Harriet

Larry Thor

Detective Drummond

Shirley Falls

Martha

Jay Sayer

Philip Ashton (uncredited)

Ted Thorpe

Freddy (uncredited)

Dwight Brooks

Corrupt Cop (uncredited)

Roger Corman

Director

Gerald Fried

Original Music Composer

R. Wright Campbell

Screenplay

James H. Nicholson

Executive Producer

Samuel Z. Arkoff

Executive Producer

Ronald Sinclair

Editor

Roger Corman

Producer

Harry Reif

Set Decoration

Daniel Haller

Art Direction

David Newell

Makeup Artist

Floyd Crosby

Director of Photography