The inside-the-law approach that works to some limited extent is public community rejection. Things like large groups showing up and standing with their back to the Nazis.
The method that has historically stopped Nazis like this involves getting some level of police cooperation and beating them up
It’s weird. They’re the minority, and yet they adore bullying those that are different. Maybe try standing in front of them with at least as many people…? They’re Nazis. They’ll turn around and go home…