The latter film, which stars Daniel Radcliffe as a farting corpse, won an award for its direction
The Birth of a Nation took home two major awards at Sundance Film Festival.
The film, which tells the story of slave rebellion leader Nat Turner, won both the Grand Jury Prize and the Audience Award at the festival.
Nate Parker’s epic is the fourth film to have won both awards, following in the footsteps of Me and Earl and the Dying Girl, Whiplash and Fruitvale Station.
“That film connects with a nerve,” said actor Robert Redford, who co-founded the Sundance Institute in 1980.
Fox Searchlight has acquired the film for $17.5m (£12.9m), the most ever paid for a Sundance film.
“I’ve always felt this pull on my art toward activism. That’s why I always say I’m an activist first” Filmmaker Nate Parker discusses his film The Birth of a Nation, the power of art to spark change and #Sundance 2016
Posted by Sundance Film Festival on Friday, 29 January 2016
The Grand Jury Prize for Documentary went to Weiner, which charts the political downfall of former New York politician Anthony Weiner.
The Audience Award for Documentary was awarded to Jim: The James Foley Story, about the American photojournalist killed by ISIS members in Syria.
Swiss Army Man won an award for Daniel Sheinert and Daniel Kwan’s direction. The film which stars Daniel Radcliffe as a farting corpse reportedly prompted walk-outs.
“It was great and original and exciting and completely mad, and unlike anything else I’ve ever done or read,” Radcliffe recently said of the role.