Forced-labour asparagus

Adrian Mogos describes the use of forced labour in Central European. They were producing food for Tesco, among other outlets:

Corina says they worked in the fields under Ukrainians carrying shotguns who hit anyone that dared ask about the wages they’d been promised or protested over the conditions and hours.
Around 400 hundred men and women were kept working around the clock, sleeping in a dormitory, and they were not allowed to leave the fields unless their Ukrainian bosses transferred them to constructions sites or slaughterhouses.
...
After two months of working for free under these armed guards, Corina knew she’d never get any money. When she and her husband protested, they threatened to sell her off to a pimp to work as a prostitute in Prague. Finally, she, her husband and one brother-in-law fled the camp by night in the summer of 2008.