There are loosely associated groups within them. Some of them are Moorish sovcits, which are loosely associated with the Moorish Science Temple, although they don't like that, and they're all black people who claim to be indigenous to the US. Some of them call themselves secured party creditors, and another big group go by American State Nationals. They're not like an organization, just a bunch of whackadoos who believe the same kind of crazy. I highly recommend looking them up on YouTube because there's a million videos of them getting pulled over, arguing with the cops that they don't have to have a license or insurance because they're travelling not driving and then getting yanked out of their cars and tased. They believe they can pay their bills and they have fake license plates that say Private, and sometimes fake passports.

Here is a good article about them:

https://www.adl.org/resources/backgrounder/sovereign-citizen-movement-united-states

One of their fake plates; there are a few other kinds but this is the most common.

Another kind, the American State Nationals kind:

American State Nationals ID, the red fingerprint is a thing they do for some unknown reason on documents and ID: