Italian police on Tuesday made 31 arrests in connection with an alleged plot by an offshoot of the **torious 'Ndrangheta crime group to take control of Rome's cocaine trade. Based in the impoverished southern region of Calabria, the 'Ndrangheta is said to be behind most of Europe's cocaine business, and is regarded as the most powerful mafia organisation in Italy. Tuesday's arrests were made following revelations that emerged from an investigation into the 2013 murder of Roman mobster Vincenzo Femia. The bosses of 'Ndrangheta's semi-auto**mous Roman offshoot were reported to have lived in the capital for years, and to have established their own links with cocaine producers in Colombia and smuggling kingpins in Morocco.