I don't understand how someone could classify this film as a "comedy". It did have it's comedic moments, but no more than any other Western or Drama. Then that false comment ends up on the front page of the IMDb? Weird. This was a first rate Western by any standard. At a time when Hollywood had no interest in making such films. Blaxploitation films and comedies were the rules of the day. Poitier makes a great cowboy and fine director here. I suspect the reason this film is/was not more popular is that there were so few good guys of the White persuasion. The one fair and honest White man was the town Sheriff, who was quickly killed off by another White man for this very reason.
Review of Buck and the Preacher
