If its anything like cops undercover at festivals and concerts it will be pretty easy to figure out who is who.

Also just look for the guy still wearing the mask.

Organize a potluck and ask the guy with tacticool boots to bring a salad.

If it has vegetables, it’s a cop.

Just ask what they want to drink. I’m sure most of these “agents” are from the south and will knee jerk “sweet tea” or “coke”.

Bet they learned that from Israel

If your local aid group does not know about OPSEC and compartmentalization, it's probably time to form a new aid group.

"Show me your Antifa member card please"