The Chinese high-tech companies blacklisted by Washington over alleged ties to rights abuses are rising stars in China’s ambitious drive to overtake the United States in the technology sector.

They make surveillance cameras, facial recognition software and other technology that has become ubiquitous in Xinjiang, the heavily policed northwestern region where an estimated one million mostly Muslim minorities, like ethnic Uighurs, are held in internment camps.

The eight firms were added on Monday to a list of 28 entities that US companies are barred from selling components to without government approval.

Here is a look at the companies targeted: