The rooms where ruddy-faced Chinese men and women once assembled to pray in Hebrew and Mandarin are silent. Signs and exhibits that celebrated centuries of Jewish life have disappeared. An ancient well, believed to be the last visible remnant of a long-demolished synagogue, was recently buried under concrete and a pile of earth.. After locking down Buddhist monasteries in Tibet and tearing down church crosses in eastern China, President Xi Jinping’s campaign against unapproved religion and foreign influence has turned to an unlikely adversary: a small group of Jews whose ancestors settled in this now faded imperial city near the...