US funnyman Richard Pryor (news) is calling on Americans to boycott fast-food giant KFC for allegedly allowing chicken cruelty, animal rights activists said. Pryor, 62, has joined a crusade against the US fried chicken house that has outlets across the globe being waged by People for the Ethical Treatment of Animals' (PETA) in an advertising campaign to be launched Thursday. The comedian and actor will appear in ads in African American newspaper and on billboards across the United States that bear an appeal to Americans to stay away from the colonel's finger lickin' good snacks, PETA said. "KFC supports cruelty...