Tens of thousands of ethnic Uighurs were moved to work in conditions suggestive of “forced labor” in factories across China supplying 83 global brands, an Australian think tank said in a report released on Sunday. The Australian Strategic Policy Institute (ASPI) report, which cited government documents and local media reports, identified a network of at least 27 factories in nine Chinese provinces where more than 80,000 Uighurs from the western region of Xinjiang have been transferred.

“Under conditions that strongly suggest forced labor, Uighurs are working in factories that are in the supply chains of at least 83 well-known global brands in the technology, clothing and automotive sectors, including Apple, BMW, Gap, Huawei, Nike, Samsung, Sony and Volkswagen,” the think-tank said in the introduction to its report. The ASPI report said the transfers of labor were part of a state-sponsored program.

It says the workers “lead a harsh, segregated life,” are forbidden to practice religion, and are required to participate in mandarin language classes. It also says the Uighurs are tracked electronically and restricted from returning to Xinjiang. China’s Foreign Ministry on Monday said reports the government had violated the Uighurs’ rights were untrue.