One proper method is to designate ANTIFA, or at a minimum the foreign elements as a foreign terrorist organization (FTO), this can also be done for allied groups which carry extreme violent beliefs and meet the simple FTO criteria
https://x.com/TheLegalMindset/status/1968562676415807537
https://x.com/TheLegalMindset/status/1968562676415807537
https://x.com/TheLegalMindset/status/1968562676415807537