In early April 2019, Rep. Grace Meng was launching into a busy legislative week on Capitol Hill. The same day in the central Chinese province of Henan, two Meng associates were delivering a letter of appreciation from her to the chief of an international influence operation managed by the Chinese Communist Party. A common denominator in both the China trip and in Meng’s political rise is a New York association of Chinese-Americans like her. The two travelers to China were...