No criminal group surpasses the Ndrangheta in terms of power in Europe. After all, the Ndrangheta largely controls the European cocaine trade. While it's true that Albanians, Kurds, Turks, South Asians ( Pakistanis, Sikhs and Bengalis), Serbs & Montenegrins and Mhallami run the smack trafficking, the fact remains that cocaine is a much more desired narcotic than heroin in Europe.
Only in the UK, Ireland and the south of France the Ndrangheta has a negligible influence on the cocaine trade. In the UK and Ireland because British and Irish groups have succesfully set-up direct links to Colombian cartels. In the south of France because the Corsican clans still hold influence over there and because North African groups ( and in turn the Gypsies they often run with) often have deals with the AQIM who in their turn have links with Colombian cartels.
In any other European country you can bet your life on it that the Ndrangheta has a finger in the trafficking of cocaine.