The United States on Monday announced sanctions against a new group of Chinese companies for alleged involvement in human rights violations in China’s Xinjiang region, accusing the firms of supporting a “campaign of repression” against Uighurs and other minority groups.

The Commerce Department added 11 companies to a trade blacklist over the alleged Xinjiang violations, bringing to nearly 50 the number of Chinese entities on the list. The sanctions restrict the companies’ access to U.S. technology and other goods.