Follow the money behind Antifa and BLM.
Find the money.
Seize the bank accounts and other assets of the criminal sources of funds under the anti-terrorism laws.
That is _my_ kind of non-violence. :-)
Unless the money is seized, they will just find more willing dips to perform violence. Stop the money flow and the majority of violence stops.
That would require the FBI. They are part of the problem.
Mine too. Truth is a severe weapon.