From the 1989 Spike Lee joint Do The Right Thing, this song transcends the movie, which itself ends in a race riot.
This version of the video (which, yes, Spike Lee was involved with) isn't a real riot or even a rally, but it looks like one. It IS a pretty clear demonstration of the group's political stances in the day. Flavor Flav has moved on to a less political stance where he doesn't say "motherf*** him" about Elvis or John Wayne. The video also featured Tawana Brawley in a cameo appearance - I won't go into her story here except to say that it was a very polarizing one in this community.
It's a great, powerful song - I'd almost say manifesto - that just happens to have been featured in a movie.