No reason to mention orgs we all know exist and who no one is advocating for. That's base knowledge. Problem becomes when groups go on the list only for being standard conservative.
Again: Here's Antifa telling you they're real -
imgflip.com/gif/a7lwbm. That they aren't real is a brand new idea that I never thought anyone would try to push. Especially not since Trevor Noah made a puff-piece about them in 2016 and several documentaries after that. It's never before been questioned whether or not they exist - the left's approach has always been things like "they're so few, why bother" and "they're not violent".
There's endless video of them destroying businesses. The looting-part is not what I know them for, so I won't necessarily blame them for that... yet - perhaps the American ones are different than the Danish ones I know personally