Keep in mind the Democrat Marxist Left is trying to bait American Patriots into violence, and they have infiltrator-agitators at every conservative peaceful protest to False Flag violence and unamerican slogans.
The way you handle that is to use defensive force. If they show up with obvious provocative banners or signs, first ask them nicely to leave and then if they refuse get a large enough group of people to herd them out of there. And if they try any kind of false-flag violence, tackle them to the ground and hold them for police. If the police are compromised and refuse to do anything then use the previous method to outnumber them and drive them out of the area.
And record EVERYTHING, so if that agitator your confront turns out to be a Fed you can prove what they engaged in.