While the western was a staple of cinema for many decades, the form began to fade as its greatest star, John Wayne, made fewer films of distinction toward the end of his career. In the mid-1960s, the genre was redefined by a handful of directors, including Don Siegel and Italian filmmaker Sergio Leone, who offered something edgier, bloodier, and more violent. Working with both directors was an actor who had made a name for himself on the small screen...