Payment in Blood (1968)

About this title: When Confederate Army regulars take to robbery and murder, a bounty hunter masquerades as a Southern sympathizer to join the renegades. Led by Colonel Blake (Guy Madison), the group terrorizes the border between Texas and Mexico, striking fear into the hearts of people in both countries. Stuart (Ed Byrnes) risks his life by joining up with the gang in order to bring the killers to justice and collect on the reward money in this violent spaghetti western Dan Pavlides, All Movie Guide

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