Behind The Bastards: Robert Evans (formerly of Cracked fame) talks about the worst people in history for hours.
Oh No Ross and Carrie: "When they make the claims we show up so you don't have to." Maybe start with the series on scientology, it's some of the best work they've done.
Most of the other stuff I listen to is either industry specific or fandom/hobby specific.
ONRAC is one of my favorites. They have such a lovely approach to crackpots and charlatans of all stripes. Gentle mockery leavened with genuine engagement with the aim to better understand these bowel movements of human thought and expose the underlying motives of grift behind so many of them.