apologies if this has already been posted:

Indiana’s ‘sovereign citizens’ renounce their U.S. citizenship, claim to secede from the Union.

Indiana RTV6 reports that “an increasing number of Indiana residents” are taking radical right-wing “tenther” beliefs to their logical extreme, declaring themselves “sovereign citizens” exempt from federal law and from paying taxes. These individuals claim their homes are embassies and have started “using identification cards that show them as diplomats.” The state reports that about 10 people a month have been asking for an official seal which supposedly exempts them from paying taxes. Some “sovereign citizens” have even refused to use drivers licenses or plates. When challenged by police, they show a homemade ID and claim that “no one can delay, detain or arrest them without facing damages of $2 million”:

Similar groups of “sovereign citizens” have been reported in several other states as well.
ADL link for background info on the movement.