There are a bunch. I like that you included cults here. I get the scam artist feel from a lot of religious groups and if I was going to run a scam that is the route I would go but I have these damn ethics lol.

There was a while where I was getting calls from the fake IRS like every day. I heard some of that ring got busted recently though. Come to think of it, there is a pretty funny YouTube channel where the guy trolls phone scammers all day. I think it is called Hoax Hotel or The Hoax Hotel. It will come right up if you look for it and it is totally worth watching.