BBC4TVs Storyville documentary strand has broadcast a film history of the Black Panther movement. The Panthers were the most theoretically sophisticated branch of the civil rights and counter-cultural movements in the US. Their structural understanding of the intersectionality of discrimination was fifty years ahead of its time…

https://www.bbc.co.uk/iplayer/episode/b071gr5h/storyville-the-black-panthers

There’s also a longer PBS documentary about the Panthers.