Follow the money.
https://www.ammoland.com/2017/07/antifa-osint-profile-leaders-weaknesses-exposed-part-3/
There should be a federal investigation of these mayors to see why they are colluding with Antifa.
If any connection can be established, arrest the mayors for RICO.
One or two arrests should send the necessary message to the rest of them.
But the FBI trained Antifa...