Run for Cover (1955)

An honest gunfighter is released from prison after serving time for a crime he did not commit and soon befriends a young upstart. When the older man is appointed sheriff of a nearby town, he insists that his protege is made deputy - but soon discovers his loyalty is misplaced. Western, directed by Nicholas Ray and starring James Cagney, John Derek, Viveca Lindfors and Jean Hersholt.