A widely-exported line of farmed shrimp from Thailand is fed on fishmeal made by slave labor, a six-month investigation by the Guardian has revealed:

The investigation found that the world’s largest prawn farmer, the Thailand-based Charoen Pokphand (CP) Foods, buys fishmeal, which it feeds to its farmed prawns, from some suppliers that own, operate or buy from fishing boats manned with slaves.

Men who have managed to escape from boats supplying CP Foods and other companies like it told the Guardian of horrific conditions, including 20-hour shifts, regular beatings, torture and execution-style killings. Some were at sea for years; some were regularly offered methamphetamines to keep them going. Some had seen fellow slaves murdered in front of them.

CP Foods supplies shrimp (or prawns, as they are known in the UK), to grocery giants including Walmart, Costco, and Tesco.