I heard these guys just once; and then only briefly.
Aswad were playing at the "1st Chelmsford Punk Rock Festival" in '76 (or '77?); sadly a large group of idiots thought that reggae wasn't appropriate and pelted them with beer cans - so Aswad, having asked for peace and getting none, to Essex's eternal shame, left the stage.
But the band and their music must have had an impact on a young lad transplanted from Yorkshire...