William Sampson Jr. was a Muscogee Nation painter, actor, and rodeo performer. He is best known for his performance as the apparently deaf and mute Chief Bromden in the 1975 film One Flew Over the Cuckoo's Nest and as Crazy Horse in the 1977 western The White Buffalo, as well as his roles as Taylor in Poltergeist II: The Other Side and Ten Bears in 1976's The Outlaw Josey Wales.

The Muscogee Nation, or Muscogee (Creek) Nation, is a federally recognized Native American tribe based in the U.S. state of Oklahoma. The nation descends from the historic Muscogee Confederacy, a large group of indigenous peoples of the Southeastern Woodlands. Official languages include Muscogee, Yuchi, Natchez, Alabama, and Koasati, with Muscogee retaining the largest number of speakers. They commonly refer to themselves as Este Mvskokvlke. Historically, they were often referred to by European Americans as one of the Five Civilized Tribes of the American Southeast.