The Levellers Folk band.

"The Levellers are strong supporters of many causes. Among these is a movement to repeal the Criminal Justice Act which revokes the rights of citizens of the United Kingdom to protest, strike or to live the lifestyle of a New Age Traveler. "
Alex’s Leveller’s page
See also a comment:
and then go to their website

See also:
The Diggers or Levellers, the first English agrarian communists