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