Let's start calling pathetic groups like Antifa and Black Lives Murder what they are; terrorist groups, hate groups, racist groups. That is how they should be classified.
Our police forces should treat these "groups" with quick and decisive action when confronted or when they are physically harassing law abiding citizens. The order should always be to put them on the ground using what means necessary, tie strap them, and haul them in charging them with all that the law provides. Starting with assault and creating a disturbance and go from there. Give every one of them a criminal record and make it as expensive as possible. Every time.