A billionaire with links to the family of Xi Jinping was reportedly taken from his apartment in the Four Seasons in Hong Kong by Chinese police and taken to the mainland. Xiao Jianhua, one of China’s richest men, is currently in police custody on the mainland, the Financial Times and New York Times reported. He may be assisting with a graft investigation, part of the Chinese president’s sweeping campaign that critics say is more about consolidating power than tackling corruption. If Chinese police were involved in Xiao’s abduction from Hong Kong, it would appear to violate the former British colony’s...