Globalised slavery: how big supermarkets are selling prawns in supply chain fed by slave labour – video A six-month Guardian multimedia investigation has, for the first time, tracked how some of the world's big-supermakets, Tesco, Aldi, Walmart and Morrisons, are using suppliers relying on slave labour to put cheap prawns on their shelves. Slavery is back and here's the proof. Narrated by Benedict
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