If you are a podcast fan, I recommend Scam Goddess, which is run by Laci Moseley who is fucking hilarious and frequently approaches the trade from a pro-scam perspective. She is also having a Moment: she's published a memoir and recently got a television show of her own with a limited run on Max. The episode on Dixon, IL is my favorite: that small town was scammed out of $53 million by Rita Crundwell, who pissed the money away into her small empire of western pleasure quarter horses. Laci is very much an indoor cat and goes in for a fairly hyperfemme fashion style, complete with long fake nails, and she is hilariously visibly bewildered about why anyone would pay money to ride horses. And skeptical of the entire concept of horses, for that matter. As someone who quite likes horses, it was incredibly funny to watch--and the scam itself is one hell of a humdinger, too.
Stolen World by Jennie Erin Smith is a slight change of pace: it's about the early acquisition of herps (reptile and amphibian species) by zoos and museums, which was cartoonishly corrupt and involved a lot of animal smuggling. It was truly fascinating.
I would also love it if more people got into medical scammers and grifters, because boy howdy, if you want to look at a death count, those folks often beat the serial killers all hollow. In that vein...
Charlatan by Pope Brock is all about the goat balls-themed radio empire of Charles R. Brinkley, who made himself cartoonishly wealthy by selling surgeries in which he would cure whatever ailed you by tucking freshly-removed goat testicles alongside your own testicles, nestled nicely in your sac. (If you did not come with your own ready-made testicles, he did not have a lot of thoughts unless your problem was infertility. In this case, he would tuck some goat balls or some goat ovaries--your choice depending on what sex of kid you wanted to have--right alongside your own ovaries instead.) Brinkley was so successful he inadvertently spurred the creation of the American Medical Association, which lead to getting knocked off the airwaves and spurred him to run for Kansas governor as a write-in candidate on the platform of "give me my medical license and also my radio show back", and he nearly won.