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 delusion that always baffles me is gang-stalking. For the ones who don’t know, there is a fairly common delusion where someone believes that they are being gang-stalked. They think random people going about their day-to-day lives are actually secretly working together to stalk the one person specifically. They think people band together and form massive gangs for various surveillance/stalking reasons. For fun/gossip, for government tracking, for secret shadow cabals keeping tabs on people, etc.
That person you pass during your walk, who politely nods as they pass you? They were an agent, and now everyone knows where you are.
That girl you see walking her dog past your house three times every day? She’s making a thrice-daily report on you.
That utility worker, doing maintenance on the power lines? They secretly installed an antenna to track when you’re at home.
That dude who edges past you in the grocery store, because you took up the entire goddamned aisle with your cart sitting in the very middle of the row while you stopped for three fucking minutes to look at three different brands of pickles? (Just pick one and get the fuck out of the way already!) Obviously he was trying to plant nanite tracking robots on your groceries, so the group can listen to your thoughts after you eat them.
I think it’s due to the (extremely common) “I’m being watched” paranoia, without having a specific target to pin the blame on. Instead of that breaking the delusion and realizing that nobody specific is watching them, they simply pin the blame on everyone around them.
The even worse part is that if you simply search up “Gang stalking”, you’ll find the wiki article on it… But you’ll also find a bunch of websites made by deluded people, who legitimately believe they (and thousands of others around the world) are being gangstalked. They call themselves “targeted individuals” and it very quickly becomes a self-perpetuating delusion. Any attempts to break them out of it only serve to reinforce the delusion, because obviously you’re a gang-stalker sent to try and trick them.
well the interesting thing is that it actually CAN happen, it’s just extremely rare and is almost always related to prejudice in some way (somebody non-white or a gay couple move to a conservative rural community) or domestic violence on the part of someone powerful enough to have lackeys (or peers, like a cop and their coworkers). The church of scientology has also been known to use gangstalking against people who speak out. But no the goverment isn’t stalking random people because they’re telepathic (my brother-in-law’s delusion).