When these fellas were doing what they did I was into indie that was mainly put out on 7" records and in polythene bags and even I have heard of some of these. Without googling Horace Andy has worked with Massive Attack a **** ton. Tackhead Even of you haven't heard of the band, you have heard of at least Doug Wimbish or Adrian Sherwood. Mark Stewart was one of them people that seemed like he was on Snub TV all the time if you haven't heard of the Mafia, his older band The Pop Group are more well known.
African Head Charge, I always got them mixed up with American Head Charge so these are either a dub band or an industrial metal band. My money would be on the former.
The point is yes these weren't pop stars on the cover of Smash Hits every fortnight but they aren't completely unknown. On U was a well known and respected label. You must all know Beef by Gary Clail surely?