Start rounding them up just like they did for Jan 6. First, start the deportations. Only allow them a legal appeal once they are back in their home country. Second, start the identification, arrest and prosecution like they did on Jan 6. Third, do a forensic audit of every deported/arrested participant the see who paid them for their illegal protest, vandalism, and violence. Fourth, prosecute those entities for aiding/abetting domestic terrorism. Equal protection and prosecution under the law. Nothing more. Nothing less.
Start by cutting off their welfare benefits. Make a fair offer to deport them in a civilized way to their countries of origin as they turn themselves in.
Liberals who want to keep them would have to do so at their own expense.