No Name on the Bullet (1959), Audie Murphy, Joan Evans

No Name on the Bullet is a highly regarded 1959 American CinemaScope Western directed by Jack Arnold. The film stars World War II hero Audie Murphy in a rare role as the villain—a cold-blooded, philosophical hired gun named John Gant.

Wikipedia
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🎬 Core Plot
The Arrival: Professional killer John Gant rides into the quiet town of Lordsburg.
The Panic: He refuses to name his target, causing the corrupt townspeople to turn on each other out of sheer paranoia (GOOGLE).