I very nearly almost said something along the lines of "I don't know that many libertarians that are into punk". Don't know what I'm thinking these days 
I found that they're mainly into prog rock and heavy/death metal.
Old punk has been so mainstreamed at this point.
The Occupy/Anarchist/Left stuff I've been to lately seem to be full of like...is it folk rock? At the occupy thing I asked about punk regarding all the hippie crap on stage and the response I got was that it was too noisy and upsetting. (And they aren't wrong about some of the new Punk that's seemed to take the wrong lessons from old punk/emo*.)
*I can't remember them now but I came across this great band on purevolume or something years ago that touted itself as "revolutionary anti-imperialist punk" so of course I had to listen. It was like thirty one minute long random guitar and drums (that were all indistinguishable and just fast/loud) with screaming (by multiple band members at times) of random phrases taken from what was probably a Noam Chomsky book overtop.