In recent years Cosa Nostra or the Sicilian Mafia has been eclipsed by the 'Ndrangheta or Calabrian Mafia as Italy's most powerful crime group due to its obscene profits from the cocaine trade as reported by Tristan Dessert for France 24:
The 'Ndrangheta controls the majority of international cocaine traffic, with an estimated 80 percent monopoly on European imports of the white powder. The organisation pulls in 44 billion euros a year; that's almost three percent of Italy's GDP, which means the 'Ndrangheta has as much financial clout as a small European country, or a huge multinational corporation.
The drug trafficking crime group launders much of its dirty money in the German economy where it invests "millions of euros in hotel chains and restaurants (they own 300 pizzerias)" according to Petra Reski in her new book The Honoured Society as reported by P.D. Smith for The Guardian.
The 'Ndrangheta has migrated from Italy's southern Calabria region into the wealthier northern cities, and further has become entrenched in Australia, Canada and the United States with surprisingly little push back from law enforcement in those countries.