From Wikipedia
Incident at Oglala is a 1992 documentary by Michael Apted,
narrated by Robert Redford. The film documents the killings of two
Federal Bureau of Investigation agents, Coler and Williams, on the Pine
Ridge Indian Reservation in 1975, and the legal case surrounding the
subsequent trials of Robert Robideau, Darrell Butler, and Leonard
Peltier. Peltier was convicted of murder, but many, including the
International Indian Treaty Council, believe Peltier is innocent of the
crimes. Apted was nominated for the Critics Award in 1992 for this film.