The views they disagree with are fascist views so yes duh. they are literally anti-fascists. Have you any examples of them opposing any views which aren't fascist, violently or otherwise? We should oppose that.
http://www.weeklystandard.com/a-beating-in-berkeley/article/...
Attacking free speech rallies is terrorism, not "fighting fascism". In fact, the US Dept of Homeland Security already categorized them as a domestic terrorist group in 2016.
Even the extreme left LA times admits they're bad in the wake of their terror attacks at Berkley - http://www.latimes.com/local/lanow/la-me-far-left-violence-2...
The fact that they wear masks to everything should clue you in on their evil, lawless intent. Law abiding people who oppose facism don't need masks.