Introduction

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)