On October 24, 1871, a mob of roughly five hundred people, close to a tenth of Los Angeles, descended on the Chinese quarter and lynched eighteen or nineteen men and boys in a matter of hours. Convictions were overturned in 1873 on a charging technicality. In the decade that followed, anti-Chinese hatred became a governing program through ordinances, the Workingmen's Party and the Page Act of 1875, which barred Chinese women.
The death toll is contested at 18 or 19 (occasionally 17), and the mob's size of 'about 500' is an estimate rather than a count.