Sadly they are very common worldwide these days and numerous examples can be found in most countries...
I been watching their antics gong back a couple of decades the names change, but the same old BS comes from them, regardless of what they choose to call themselves- Moors, Freeman on the Land FOTLers lol), sov cits, tax auditors, same old s..t...
Theres been quite a few doozies from the UK over the years...
Michael (of Bernicia) Waugh, Elisabeth Nolson, Neelu Berry and her struck off 'lawyer' Edward Ellis, the various misfits from the Hampstead case (Neelu and Edward got involved in that as well) with several of them ending up doing serious time for their involvement), Mark Haining, 'Baron' David Ward, and probably the most infamous was 'wrecker' Rekha Patel whose descent into sovcit madness all started with a BBC reality TV show (one of those 'home improvement' ones lol) which was the beginning of her legal issues- and resulted in her losing her house and lifes savings, mulltiple arrests and evictions and a neighbourhood feud...
(Neelu was another one that the police ended up being far too familiar with her address- of course she 'won' and lost her house too lol)
And thats only the ones I can remember off the top of my head from the UK- there's heaps more...
Sadly they are far too common...