Man in the Shadow (1957)
Fifties set western starring Jeff Chandler as a small town sheriff investigating the murder of a farm hand at the ranch of the all powerful Orson Welles.
Similar in style to
Bad Day at Black Rock in both being a fifties set film and that the sheriff gets no help from the townsfolk who all seem indifferent to the killing, this is a pretty enjoyable western full of complex social significance.