How much money do the ‘Ndrangheta mafia make?

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The ‘Ndrangheta are one of Italy’s biggest and most dangerous criminal gangs. One piece of research suggested they have an annual turnover of €53bn - more than McDonalds and Deutsche Bank combined. But is that number realistic? Professor Anna Sergi and Professor Francesco Calderoni help us figure out what kind of number makes sense. Reporter: Perisha Kudhail Series producer: Tom Colls Sound mix: Neil Churchill Editor: Richard Vadon (Picture: Human hands with strings controlling diagram. Credit: Boris Zhitkov/Getty Images)