From what you just said it sounds like you ran into Posse Comitatus.
It was a local group called "Our One Supreme Court". They claimed to be somehow connected with a Christian Church.
I had been hearing about a number of local county judges who were being targeted by these people with bogus liens, threatening mail and some oddball lawsuits. At the time, it sounded like P.C. to me, too. So I did an hour long interview with a judge from a neighboring county who was particularly annoyed by these clowns...and (this was a minor coup for me) we were also able to get Ohio State Supreme Court Chief Justice Thomas Moyer for most of the hour. Someone sent me an op-ed he wrote about this.
Well, being that it was a Christian radio station, I knew some of our listeners were extremists. Most, I am sure, just listened and digested what they heard. But my call screener said there were a number of crank calls, hangups and a couple of threats that day.
About a week later, in my mail, I got a "summons" to appear before "Our One Supreme Court". LOL -- it said I would be contacted by telephone or "other means" to let me know when and where the "court" would convene. They charged me with treason against the United States and being "an enemy of the Gospel of Christ". It was my understanding that the local judge received a similar mailings, but with different "charges". Everything was handed over to the police and I never heard a word about it again. To my knowledge, no one was arrested. I am not sure there were grounds.
As to being "militia", that was the big (and more public) part of their schtick. They would show up in pseudo-military uniforms, sometimes with guns, at King Day celebrations and other community events they considered "political correctness and multiculturalism run amok".