Dale Robertson

as Melvin Purvis

Harris Yulin

as George 'Machine Gun' Kelly

Dick Sargent

as Thatcher Covington

Margaret Blye

as 'Kate' Katherine Ryan-Kelly

Matt Clark

as Charles 'Charlie' Parlmetter

David Canary

as 'Gene' Eugene T. Farber

Elliott Street

as Thomas 'Buckwheat' Longaker

John Karlen

as 'Tony' Anthony Redecci