Catch the Black Sunshine (1972)

Original title: Charcoal Black

Two slave brothers, one black, one an albino, discover a treasure map which is taken from them by their foreman. They take it back but are pursued by the foreman. Originally, the foreman seeks the aid of two bounty hunters who pursue the protagonists throughout the film. At the end, both the foreman and the bounty hunters catch up with the two escaped slaves, and the foreman has a change of heart, helping to kill the bounty hunters.