GENEVA—A U.S.-backed Uyghur photo exhibit of dozens of people who are missing or alleged to be held in Chinese-run camps in Xinjiang, China, opened in Switzerland on Thursday amid high tensions over human rights between Beijing and Washington. The “Wall of the Disappeared” which also features interviews with camp survivors about alleged forced sterilization stands outside the United Nations in Geneva where a month-long session of the Human Rights Council opened this week. “It was important for us to bring faces to represent the statistics,” said Zumretay Arkin whose uncle is featured in the exhibit. “It’s easier to forget about numbers but if people see faces, we hope they will grasp the urgency of the situation.” Rights groups estimate one million Uyghurs and other ethnic minorities have been interned in camps that the Chinese communist regime describes as vocational training centers to combat religious extremism. The United States gave a …