In Paper War, Flood of Liens Is the Weapon - NYTimes.com
It's the "sovereign citizen" movement. They are filing bogus liens against the property of government officials:
"...as Sheriff Stanek soon learned, the liens, legal claims on property to secure the payment of a debt, were just the earliest salvos in a war of paper, waged by a couple who had lost their home to foreclosure in 2009 — a tactic that, with the spread of an anti-government ideology known as the “sovereign citizen” movement, is being employed more frequently as a way to retaliate against perceived injustices. Over the next three years, the couple, Thomas and Lisa Eilertson, filed more than $250 billion in liens, demands for compensatory damages and other claims against more than a dozen people, including the sheriff, county attorneys, the Hennepin County registrar of titles and other court officials."