Indian workers in factories supplying the supermarket chains Marks & Spencer, Tesco and Sainsbury's, and the fashion brand Ralph Lauren, told the BBC they are being subjected to exploitative conditions.
Women working at a Ralph Lauren supplier said they had been forced to stay overnight to complete orders, sometimes requiring them to sleep on the factory floor.
"We're made to work continuously, often through the night, sleeping at 3am then waking up by 5am for another full day," one woman said in an interview. "Our bosses don't care. They're only bothered about production," she said.
The BBC has withheld the names of those who agreed to be interviewed, as well as the names of the factories, to protect the workers' safety.
Workers at the supermarket supplier said they had been made to endure conditions which would be unacceptable for staff employed by the same brands in the UK.
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