American Hardcore Punk band formed in Washington, D.C. in 1977, initially as a jazz fusion ensemble called Mind Power.
The band also do many reggae and dub tracks and featured elements from funk, heavy metal or hip hop.
The original line up broke up many times and some musicians replaced H.R. and Earl Hudson:
Sid McCray — lead vocals (1977–1978)
Taj Singleton — lead vocals (1988–1989)
Chuck Mosley — lead vocals (1990–1991)
Israel Joseph-I — lead vocals (1991–1994, 2008)
Mackie Jayson — drums, percussion (1988-1989, 1990-1993)
Chuck Treece — drums, percussion (1994)
H.R., Earl Hudson, Darryl Jenifer, Chuck Mosely, Dr. Know, Mackie Jayson, Israel Joseph-I