They are accused of committing "serious crimes" including activities linked to international drug trafficking, Italian police said in a statement.
The 'Ndrangheta -- which derives its meaning from the Greek word for "heroism" -- is made up of numerous village and family-based clans in Calabria, the rural, mountainous and under-developed "toe" of Italy's boot.
Despite intense police attention and frequent arrests, the organisation has continued to extend its reach.
It has surpassed Sicily's Cosa Nostra and the Naples-based Camorra in influence thanks to its control of the cocaine trade, and is the sole mafia organisation to operate on all continents, according to anti-mafia prosecutors.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)