Anarchist Exclusion Act of 1903
The Anarchist Exclusion Act, or the Immigration Act of 1903, was a law of the United States regulating immigration. It codified previous immigration law, and added four inadmissible classes: anarchists, people with epilepsy, beggars, and importers of prostitutes.
Source: Wikipedia — Anarchist Exclusion Act of 1903 (CC BY-SA 4.0)