Note: The following commentary contains graphic descriptions of human-rights abuses that may not be suitable for some readers. The story was reminiscent of the horrors of Auschwitz. Kwon Hyuk, who recently defected from North Korea, was telling a British journalist what it was like to work at Camp 22, North’s Korea’s infamous concentration camp. As Hyuk recalled, “I witnessed a whole family being tested on suffocating gas and dying in the gas chamber. The parents were vomiting and dying, but till the very last moment they tried to save the kids by doing mouth-to-mouth breathing.” Above the glass chamber, scientists...