Cut off the money and the mercenary punks go back to their mother's basement.
Step 1: Designate Antifa as a terrorist organization.
Step 2: Arrest Antifa members and learn the source of its funding.
Step 3: Create a task force of trustworthy people to gather intelligence that will lead to the arrest and prosecution of those sources. I suggest, for starters, Michael Flynn, Richard Grenell, Admiral Michael Rodgers, and William Binney.
Didn't you hear? According to the MSM it was White Supremacists all along! Those evil Right Wing Criminals invaded the PEACEFUL PROTESTS to FRAME the sweet Wall of MOMs and disrupt the peacefully protesting dindinuffins.