Interesting in this context is completely divorced from morally good/bad. Could be any group from any area at any time in history. I’ll start with a few, followers of the cult of pythagoras, contemporary black Hebrew Israelites, antiracist skinheads and the Amish (neo-luddites in general). Don’t be racist or a prick to other people discussing.
The Irish Travelers
I read Gypsy Boy recently and one of the most fascinating parts was the dynamic between the Romani and Irish Travelers. I guess it’s naive to have assumed there would be comradarie since they have similar lifestyles.