Let them come and try to take them.
They won't do that, of course, for the majority that are registered. They will induce you to go to them and deliver them.
They will frame it as a matter of national security and freeze your bank account, place liens on your property, notify your employer that you are uncooperative (or even an enemy of the state), etc.
As GG2 says:
...we are one justice away from CWII.
How will that look? At first the enemy will likely be the non-local "uniforms", and then it will get worse.