Melvin Purvis G-Man

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

Steve Kanaly

as Sam Cowley

Woodrow Parfrey

as Nash Covington

Jim Hill

as 'Jim' J. D. Longaker

Don Megowan

as Hamburger Stand Man

Hank Rolike

as Shoe Shine Man

Eddie Quillan

as Hotel Clerk

Max Kleven

as Purvis' Driver

Bob Pinson

as Buckwheat's Pa

Bill Madden

as Gas Station Boy