Here’s a link from the Anti-Defamation League on the antifa:
I think people do condemn their tactics when they are actually committing violence. But we also need to avoid false equivalences. From the ADL link:
*All forms of antifa violence are problematic. Additionally, violence plays into the “victimhood” narrative of white supremacists and other right-wing extremists and can even be used for recruiting purposes. Images of these “free speech” protesters being beaten by black-clad and bandana-masked antifa provide right wing extremists with a powerful propaganda tool.
That said, it is important to reject attempts to claim equivalence between the antifa and the white supremacist groups they oppose. The antifa reject racism but use unacceptable tactics. White supremacists use even more extreme violence to spread their ideologies of hate, to intimidate ethnic minorities, and undermine democratic norms. Right-wing extremists have been one of the largest and most consistent sources of domestic terror incidents in the United States for many years; they have murdered hundreds of people in this country over the last ten years alone. To date, there have not been any known antifa-related murders.*