Terror in a Texas Town (1958)

Sven Hanson is one of a number of farmers whom Ed McNeil wants to run off their land (because he knows there's oil on it). When Hanson is murdered by McNeil's gunman, Johnny Crale, Hanson's friend Pepe Mirada hides his knowledge of the murderer's identity in order to protect his family. When Hanson's son George arrives and takes up his father's cause, not only Mirada but also Johnny Crale begin to reevaluate their attitudes.