The 'Ndrangheta has grown to become Italy's most powerful mafia - and one of the world's most dangerous organised crime groups.

For decades, one man - the Calabrian prosecutor Nicola Gratteri - has risked his life fighting them and is now overseeing the country's biggest anti-mafia trial since the 1980s.

The BBC has been to meet him and some of those caught in the grip of the 'Ndrangheta mobsters.

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