King of the Bullwhip (1950)

U. S. Marshals "Lash" LaRue and "Fuzzy" Jones are summoned into a bandit-ridden territory by a local banker. Since the bandit, El Azote, is known to wear a mask and carry a bull-whip, the local saloon owner, not knowing "Lash" is a lawman, hies him to impersonate the outlaw, and pull a series of hold-ups which will be blamed on El Azote, "Lash" intends to return the loot he acquires to its rightful owners, after he has learned the identity of El Azote, but his own identity is discovered by the gang before he can do so.