i don't know anything about these groups, but this is something that should not happen in a free and democratic society. further, they have no due process - no way to defend themselves.

on a democratic internet with a concept of due process and a functioning rule of law, facebook would be required to seek an injunction and get a court order before it is able to do this, and these groups would be entitled to appeal the decision in a court of law.

https://globalnews.ca/news/5141557/facebook-bans-extremism-hate-policy/