It's called the Sovereign Citizen conspiracy. Some people believe that because the District of Columbia was incorporated as a city (therefore becoming a legal entity so it could have a mayor and a public-works structure and not have every decision made directly by Congress), that means that the U.S. was dissolved and "incorporated" under British law, and therefore the federal government is nOt ThE bOsS oF tHeM.

As a result, every so often, a new bunch of suckers start thinking they can use some magical incantation to make themselves exempt from all laws worldwide forever. They then speak the incantation when they get hauled before the courts, thinking the judge will have to say, "Oh, I see you are wise to the True Ways of Things, and I have no power over you. Go, then, Free Sovereign, and may God bless you as you prosper."

Then they get mad when the judge, having been given no alternative, must send them to prison for their various actual crimes because legal process is an ironclad bitch and if you won't defend yourself, they have to go with the prosecutor's version of things.

Basically, it's a literal conspiracy theory, built on ignorance of historical Western legal tradition, that results in real harm. I speak against it fervently because it pisses me off down to a personal level that so many people destroy their lives and families for a lethal hit of deludium.