Three the Hard Way (1974)

Synopsis
The "three" alluded to in the title are played by Jim Brown, Fred Williamson and Jim Kelly. Letting their fists do all the talking, the hard-nosed trio takes on a neofascist organization. It is the avowed purpose of this all-white hate group to "cleanse" Los Angeles, Detroit and Washington DC of all blacks. To do this, they plan to poison the drinking water with a secret formula that affects only African Americans. ~ Hal Erickson, All Movie Guide