Sweet Sweetback's Baadasssss Song (1971)

Sweet Sweetback is a black orphan who, having grown up in a brothel, now works there as part of a sex show. When the police need a patsy for a murder in the black community, His employer gives him up to two white cops, whom he ends up killing. Suddenly the target of a massive manhunt, he decides to flee to Mexico. As he makes his way there, he is captured by, and escapes from, both the cops and a chapter of the Hell's Angels.