In this era of unchecked anti-Chinese passion, even Americans of Chinese descent found themselves subject to extralegal attempts to strip them of their rights—and their citizenship. John Wise, the collector of customs in San Francisco, would accept testimonials only from Caucasians to verify the U.S. citizenship of Chinese Americans. In an 1893 letter to a California lawyer, Wise boasted that his policy made it “almost next to impossible to prove the birth of a Chinese in this country as they never call in a white physician, and twenty years ago, no record of these births were [sic] kept.”  (Chang 137)