Beyond the Last Frontier

Beyond the Last Frontier is a 1943 American film about an undercover Texas Ranger, Johnny Revere, within Big Bill Hadleys gang of crooks. Howard Bretherton directed the film and John K. Butler and Morton Grant wrote the screenplay. The film stars Eddie Dew as Johnny Revere, Harry Woods as Big Bill Hadley, Robert Mitchum as Trigger Dolan, Lorraine Miller as Susan Cook, and Smiley Burnette as Frog Millhouse.

Source: Wikipedia