China forces minorities from Xinjiang to work in industries around the country. As it turns out, this includes handling much of the seafood sent to America and Europe.

The labor program is part of a wider agenda to subjugate a historically restive people. China is dominated by the Han ethnic group, but more than half the population of Xinjiang, a landlocked region in northwestern China, is made up of minorities—most of them Uyghur, but some Kyrgyz, Tajik, Kazakh, Hui, or Mongol. Uyghur...