The Black Gestapo

The Black Gestapo is a 1975 American independent blaxploitation crime film about a vigilante named General Ahmed, who starts an inner-city "People's Army" to protect the black citizens of Watts. However, when the Army succeeds in chasing the mob out of town, Ahmed is replaced by his colleague Colonel Kojah, who reforms the movement into a National Socialist criminal organization in order to have complete control over the town.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.