Reports by the AP and other news organizations have repeatedly found that people inside the internment camps and prisons, which activists call “black factories,” are making sportswear and other apparel for popular U.S. brands.

The AP tried to visit Hetian Haolin Hair Accessories Co. more than a year ago during an investigation into forced labor inside the camps. But police called the cab driver taking AP journalists to the area, ordering the driver to turn back and warning that the cab’s coordinates were being tracked.

From the road, it was clear the factory — topped with “Haolin Hair Accessories” in big red letters — was ringed with barbed wire fencing and surveillance cameras, and the entrance was blocked by helmeted police. Across the street, what appeared to be an educational facility was topped with political slogans declaring “the country has power” and urging people to obey the Communist Party. It was unclear whether the factory was part of a detention center, but former detainees in other parts of Xinjiang have described being shuttled to work in fenced, guarded compounds during the day and taken back to internment camps at night.

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“It is likely that many slave labor products continue to surreptitiously make it into our stores,” said Smith, a New Jersey Republican who has taken a lead on anti-human trafficking legislation