With a not very subtle warning, a Brooklyn, N.Y., Housing Court judge has ordered a “sovereign citizen” to pay his debts with real money, and suggested that retaliatory shenanigans against the court will spark a sharp reaction from the bench.

Judge Marc Finkelstein, in a decision last week, traced the origin and tactics of an apparently growing group of gadflies who view themselves as beyond the realm of government, attempt to settle their debts with fictitious and worthless money orders, and sometimes harass unsympathetic judges by “filing retaliatory fraudulent and bogus property liens and tax forms that are designed to ruin the officials’ credit rating and cause them to be audited by the IRS.”