The industries that SPAM are pretty typical of your shady businesses. I expect SPAM to peddle things like pornography, drugs, casinos, and easy money scams. Pretty much any industry you find in a SPAM message is safe to put on your "don't do business" list. Today I saw a new industry I hadn't seen in SPAM before—insurance. Seems fitting too they are also in the ranks of those who are involved with money laundering, redistributing prescription drugs, and selling sex.