Orson Welles' F for Fake: https://www.imdb.com/title/tt0072962/
Robert X. Cringely's Triumph of the Nerds: https://en.wikipedia.org/wiki/Triumph_of_the_Nerds
The Maysles Brothers' Gimme Shelter: https://www.imdb.com/title/tt0065780/
Randy Olson's Flock of Dodos: https://www.imdb.com/title/tt0800334/
Les Blank's Burden of Dreams: https://www.imdb.com/title/tt0083702/
Steve James' Hoop Dreams: https://www.imdb.com/title/tt0110057/
Chris Hegedus and D.A. Pennebaker's The War Room: https://www.imdb.com/title/tt0108515/