5 Card Stud (1968)

1880. During a dangerous five-card stud poker game in the dusty town of Rincon, Colorado, an unwise gambler is caught stealing before the eyes of one of the players, Van Morgan. As a result, the short-tempered, and trigger-happy gambler, Nick Evers, leads an angry, five-men lynch mob to exact his own kind of justice, only to see one of his poker companions dead a few days later. As more men meet their death, Van Morgan realises that he may be next, while in the meantime, the cryptic and righteous preacher, Reverend Jonathan Rudd, arrives in town, as suspicion spreads like wildfire.

IMDb: https://www.imdb.com/title/tt0062626