The United Nations Human Rights Council has been a bad joke for a long time, with many of the world’s worst human rights abusers honored with membership. But tomorrow we will see the reductio ad absurdum, as Mauritania is voted onto the Human Rights Council. While the Mauritanian government officially denies that slavery is ongoing in the country, Mauritanian watchdog groups allege that one out of every two members of the country’s Haratine ethnic minority group are enslaved, and that as many as 20% of the population is enslaved. The exact number of slaves within the country is unclear, and...