Charles Bronson

as George R. 'Machine Gun' Kelly

Susan Cabot

as Florence 'Flo' Becker

Morey Amsterdam

as Michael Fandango

Richard Devon

as Apple

Jack Lambert

as Howard

Frank De Kova

as Harry

Connie Gilchrist

as 'Ma' Becker

Wally Campo

as Maize

Barboura Morris

as Lynn Grayson

Lori Martin

as Sherryl Vito

George Archambeault

as Frank

Robert Griffin

as Mr. Andrew Vito

Mitzi McCall

as Harriet (uncredited)

Larry Thor

as Detective Drummond

Shirley Falls

as Martha

Jay Sayer

as Philip Ashton (uncredited)

Ted Thorpe

as Freddy (uncredited)

Dwight Brooks

as Corrupt Cop (uncredited)

Michael Fox

as Detective Clinton