For a while in the 80s, a fair amount of stuff happened off the back of anarcho punk bands like Conflict and Crass, and the subculture that surrounded it. The animal liberation, anarchist and anti-fascist movements were closely entwined with the music. Unfortunately I missed out on seeing Conflict in their heyday (too busy listening to metallica in my teens), but Mrs Daz went to a fair few gigs and has stories of lines of riot police and/or BNP/C18 thugs waiting outside gigs for the inevitable post-gig riot.
[video]https://www.youtube.com/watch?v=9z7GWUZKXIw[/video]