Director Martin Scorsese is most often associated with classic movies about wise guys and gangsters. But with his upcoming film Killers of the Flower Moon, the director is tackling a new genre with his first-ever Western. The film, an adaption of journalist David Grann's 2017 nonfiction book Killers of the Flower Moon: The Osage Murders and The Birth of the FBI, tells the story of at least twenty murdered members of the Osage Tribe in Oklahoma during the 1920s in Oklahoma.