There is a group in the US that would fit that definition to a tee. They are known as Antifa or the Anti-fascist. I have written about this group in the past for Ammoland (Part 1, Part 2, Part 3). I have been following them in the US and their rise across western Europe since 2005. One thing is for sure; They believe in using any means necessary to achieve their goal of an anarcho-communist state even if that means direct violent confrontation.
Recently there has been a push to designate Antifa as a terrorist organization. There has even been a White House Petition that reached the required 100,000 signatures in record time. As of right now, the signature count is at over 300,000.
\With more and more people learning about Antifa and their tactics this signature count is likely to keep increasing.
It seems the tipping point was a rally in Berkeley, CA which was attended by Joey Gibson of Patriot Prayer. By all accounts this was a peaceful rally, or should I say it was a peaceful rally until the Antifa thugs attacked the peaceful attendees.
by John Crump