Butch Cassidy “The Great Train Robbery”. #mostfamouschallenge #butchcassidy #SundanceKid #tombstone. Butch Cassidy (born Robert LeRoy Parker) was a notorious American outlaw and leader of the "Wild Bunch" gang during the late 19th and early 20th centuries. He became a legendary figure of the Old West, often portrayed as a "gentleman criminal" who preferred clever planning over gun violence. | Jeff Schreckler