When buses have been seen from out of local area delivering "protestors" for "events" it's probable they aren't "unaffiliated".But what do they do? There are no member lists that I think anybody knows of. You can arrest those who are caught in the act of illegal/terrorist activities, prosecute and imprison them, and our current DOJ does that and supports law enforcement that does that, but what about those that aren't caught specifically doing illegal acts?
Our country was founded on a principle of individual liberty, right to opinions, speech, beliefs even when those are reprehensible or unpopular. We don't arrest people for nothing more than accusations of association. That would indeed be fascist. How do you declare an organization fascist when there is no organization? No central website? No member lists? No central leadership that can be identified?
That has been my argument. But I whole heartedly support any journalist or law enforcement or our government looking for and identifying those who are directing, funding, equipping etc. these groups hat are now reported to be unaffiliated with each other. When they do, then we have a terrorist organization.
If so-called central (international) leadership is not obvious and above ground, some locals are. I provided the links on Portland, Oregon's Rose City Antifa as example.
Part of allowing official channels/government investigations will be to take a broad stance that Antifa and such are criminal in actions and intents/plans. They it becomes easier to adjust something like RICO as a tool to use against them.
Way things have been going, I fear Right Wing vigilante action will be more active and effective.