Tesco has denied allegations from charity War on Want that it is using slave labour to make its clothes.
War on Want alleges that it found workers at one of the Indian textile factorys Tesco uses, paying staff just 16p an hour.
However, Tesco has strongly denied the claims, saying they are "unsubstantiated."
Tesco said in a statement: "Out of the blue they make these allegations without producing any evidence. We insist on high standards and go to great lengths to ensure our suppliers meet them. If there is an issue in a factory supplying Tesco we will deal with it and ensure that the interests of workers are protected."
War on Want, along with campaign group Labour Behind the Label, said it will protest at Tesco’s AGM today.
The allegations follow BBC's One's Panorama programme on Monday which showed several suppliers to Primark in Southern India had sub-contracted work to children. Primark sacked three of its Indian factories as a result.
Simon McRae, senior campaigns officer at War on Want, said: "Our new evidence again reveals how Tesco's cheap clothing comes at the shameful price of workers' poverty. Again and again, scandals exposing UK retailers exploiting garment workers underline that the public cannot trust stores to police themselves. It is high time the British government legislate to stop this abuse."
Martin Hearson, campaigns coordinator at Labour Behind the Label, added: "How many times do we need to hear stories like these before Tesco gets its act together and pays workers a living wage? Every little really does help garment workers living below the breadline, especially as food and rent costs shoot up."