Italian police hold back supporters of Giovanni Tegano, a 70 year old 'Ndrangheta gangster arrested in 2010. AP The Cosa Nostra may be the most famous criminal group in Italy, but they are no longer thought to be the most powerful, thanks to a series of high profile arrests and defections.

Instead, a new, more secretive, and more impenetrable group has emerged from the Southern region of Calebria to become the de facto controller of Europe's drug trade. The 'Ndrangheta.

So who are these shadowy newcomers? Let's take a look.