Well, there is always Queensryche's song Revolution Calling. It's a good hard rock song with some interesting lyrics, but these guys bordered on being communists if they weren't out and out Marxist/Leninist.
I've always found it pathetic these far left entertainers making gobs of money thanks to capitalism while doing everything they can to undermine the very system that is making them rich.
Mindcrime was an awesome concept album. I always find it interesting that Hard leftists make such good dystopian fiction. Music/story/whatever.
Probably wish fulfillment on their part. That and they are so close to their subject matter.