For those who have been around in skeptical circles for a while, you're probably aware not only of skeptic Brian Dunning and his Skeptoid podcast, but also of his conviction for wire fraud, in a case where he was accused of cookie stuffing. Wikipedia summarises it nicely on Brian Dunning's Wikipedia page:
This week I've looked at what might be behind a funny story about combat-ready mermaids, and found out that it's not the answer I thought I was going to find. I also did a silly thing, and joined a Multi Level Marketing scheme - but don't worry, it's all above board. Just email me if you'd like to join my downline or buy some of my scrapbooking products, and I can give you my affiliate link.