The Film-Noir-Western

It has the elements of both other than a token damsel in distress common to noir. McCready goes about in his black suit and hat solving a mystery like a good detective, while at the same time he's that mysterious drifter who passes through town who is unidentifiable who associates with the weaker townspeople and takes down the big oppressing townspeople, a Western hero all in all, just not quite as scruffy as Clint Eastwood.
A good film overall, crossing two of the staple genres of American culture, and doing so well.