They physically attacked resturant workers and the owner of the resturant but NO CHARGES WERE filed. They threatened election officials, but no charges were filed. They invaded and occupied private property and no charges were filled.
This injustice and inequality before the law, will enbolden the radicals and they will be more violent on a larger scale. They have a lot of money and the way to decrease their money is to tie them up in courts every time they violate the law or the rights of others.
That supposes the courts are fair. What happens is that the injured conservative plaintiff spends lots of money and time trying to obtain justice, and ends up losing more in the end.
That said, I think a restraining order would be a cinch to get in this case. It's cheap, the disruptors are known, and the judge is likely to grant an appropriate "stay away" order, based on the conduct of the disruptors, at this particular restaurant.
It's a but tougher, but the GOP legislators might be able to get an order, not "stay away" per se, but "stay away, except at the legislators' places of legislative business." That serves to protect the interest of the union to be heard, and it protects the interest of every business that the legislator visits.