China’s government hit back at U.S. criticism of its human-rights record on Tuesday by imposing sanctions on a Los Angeles firm and two analysts involved in scouring the country’s supply chain for abuses.

Beijing said the actions under its Anti-Foreign Sanctions Law will be applied to Kharon, a research and data analytics firm, in response to its work monitoring Xinjiang, a far western region of China where the U.S. government, Western media and independent researchers have documented human-rights abuses against ethnic minorities, including primarily Muslim Uyghurs.