A good read is The Last Gangster from George Anastasia.
I've read it numerous times. if you really want to learn
from mobsters, take notes from the books and twist their
deals around so they're legitimate.

If you've got a business,and you hire subcontractors,start a trade association or union of your own and make money on the back end.

But talk to a lawyer to see if that's legal in your state or province. I did that with my little cleaning business and I make extra cash.I got that idea from reading mob books on how the mob started a trade association with garbage hauling, and made back end money every month. The Lucchese family did this with Anthony Corallo. Unfortunately the feds didn't like that.

And no I'm not giving you a bull story.