The Trump-Xi summit emphasized stability. But China’s recruitment of foreign agents has fueled suspicion of Chinese Americans.

Eileen Wang, who resigned Monday as the mayor of Arcadia, Calif., published propaganda on a purported news site under direction from Chinese officials, prosecutors said.

Lu Jianwang, a U.S. citizen, is accused of working on behalf of the Chinese government to target dissidents. A co-defendant has pleaded guilty.