Wagon Train (1940)

Pecos businessman Matt Gardner is buying up freighters, or wagon trains of food supplies, at cheap prices through intimidation, and charging high prices by deliberately causing phony food shortages at his trading posts. The only one refusing to sell his supplies is Zack Sibley, who is dead set on maintaining his freighter business as well as tracking down his father's murderer, his ex-business partner. Gardner plans on eliminating any competition Sibley presents by sending his thugs to kill him and raid his wagon train.