I’m not certain that it does actually exist as a separate entity from whatever the fashionable riot group of the season is that always exists. I remember during the first Trump presidency, someone on Twitter had a long thread where they went to several leftist protests all across the country and photographed many of the same people getting off buses and then participating at several of the protests. Some of the outfits they wore were even the same. Whether it’s an Antifa, BLM, NAMBLA, anti-ICE, ACAB, Pride, abortion, Occupy, or whatever other kind of protest that pays people to be there and then peacefully turns into a riot, the goal is the same: the destruction of Western civilization. I think it’s a reasonable assumption that the people footing the bill are also the same. Those riots are dangerous and expensive, so I think an investigation into whether someone is essentially paying people to scream ‘fire!’ in a crowded theater is warranted.
I equate these groups to how terror groups are organized in the Islamic world. They are separate but display lots of incestuous relationships.