I think he means Antifa, which is not an organisation but more of a network or movement. And no, not "most" would call them a "terrorist group".

Do you genuinely believe this? If yes, would you care to expand further on this? I'm utterly fascinated and would love to hear more background on what leads you to believe that this comparison is apt.

Why is this comment flagged? Is antifa having its own segment/talks? this would be very useful to know, as they're indeed an extremely radical organization(you can have left views and not resort to anything resembling that IMO)

Antifa is not one organization and the lowest common denominator is acting against fascism.

Maybe 'Extinction Rebellion'? I don't know though if they have a stand on this CCC event.

https://www.golem.de/news/ccc-und-die-afd-wie-politisch-darf... shows one...