The Black Panthers were largely Maoist in ideology and used Mao's little red book as a reference. If you watch Agnes Varda's short documentary on the Black Panthers you see them a lot. I was wondering how much the movie would should that they were Maoists.
The film has them reference Mao once if I remember correctly but definitely doesn't go into the group's ideology much.
La Classe Operaia Va in Paradiso (The Working Class Goes to Heaven)
Movie is great too if you can get your hands on it