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The United States is adding eight Chinese technology companies to its trading blacklist, barring some major producers of surveillance equipment from working with American companies.

In a filing released Monday, the Commerce Department said it was adding 28 entities to the list that have been “implicated in human rights violations and abuses in the implementation of China’s campaign of repression, mass arbitrary detention, and high-technology surveillance against Uighurs, Kazakhs, and other members of Muslim minority groups” in the country’s Xinjian region. The listed entities include Chinese state security bureaus, as well as the eight companies.

Those companies include Hikvision and Dahua…

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