The Man from Laramie (movie, 1955)

Will Lockhart becomes entangled in the happenings of Coronado, an isolated western town, after delivering supplies there. He is especially involved with the Waggomans, an influential ranching family, and begins his search for someone selling rifles to the local Apaches, only to find out it is the son of the most powerful man in the area. It is at this point that his troubles begin.