The mob. Hah. I don't know if there's a mob anymore, but there's many different kinds of mafias these days. Organized crime is here because there's a necessity for it in society. A police state needs a counter balance and things like prohibition and hatred fuel these necessities.
To join the mafia it would be difficult, but to get a 'gang' going wouldn't be hard. You have to understand that you can get your head smashed in, and die, never to witness green grass again, your shit robbed, and all your family deserting you.
Dealing drugs, guns, and most likely stolen property, etc. Lucrative business. Just might never amount to anything if you waste all your time trying to do yourself in for material wealth that you can't tax. Small business is where it's at. Compounding wealth. Different sources of income from different small projects to keep everything afloat.
The world is generally an intentioned place, even if you're doing dastardly things life can still be forward.
I wouldn't do any of this though, I enjoy my freedom especially and the idea of me never leaving the country really licks taint dicks.
Big business is evil. What you're doing will always be small time. I don't like this post, rambled, but I am too lazy to fix it.