CUI TIANKAI, China’s ambassador to the United States, lashed out in May at reports of human rights violations, forced labor, and genocide against the Uyghur and other Muslim minority populations of the Xinjiang region in northwest China. He said the reports are “a downright lie,” “systematic...

AFTER THE Holocaust, the U.N. General Assembly, meeting in Paris on Dec. 9, 1948, approved the Convention on the Prevention and Punishment of the Crime of Genocide. It defined genocide as, among other things, “imposing measures intended to prevent births” within a population and said genocide is...