President Joe Biden, as one of his last acts on Monday, commuted the sentence of Leonard Peltier, a Native American activist who was serving life in prison after being convicted of killing two FBI agents 50 years ago on the Pine Ridge Reservation in South Dakota.

Sundance: David France and Jesse Short Bull's film tackles the 50-year story of activism surrounding the contentious conviction of the prominent American Indian Movement leader, whose sentence was commuted just one week before the film's premiere.