Sergio Leone's 1966 masterpiece, "The Good, the Bad, and the Ugly," was the last and best of a trilogy of Leone spaghetti westerns that upended the traditional genre. Before Leone and other Italian directors like Sergio Corbucci set about redefining the Old West in Europe, traditional domestic westerns featured clean-cut leads like John Wayne, Alan Ladd, Gregory Peck, Gary Cooper, and Jimmy Stewart in films by directors like John Ford and Howard Hawks that clearly delineated the good from the bad and ugly. Not so Leone, who made the genre...