That's not a coincidence. Mafias subsist on corrupting industries and extracting illicit revenue from them. To do this, they need to have a degree of understand

That's not a coincidence. Mafias subsist on corrupting industries and extracting illicit revenue from them. To do this, they need to have a degree of understanding of the industry in question. It is far harder to corrupt manufacturing industries that compete in the global market (northern Italy) than agrarian/food service/tourism industries (southern Italy).