Immigration Act of 1924 (Johnson-Reed Act)	The quota for immigrants entering the U.S. was set at two percent of the total of any given nation's residents in the U.S. as reported in the 1890 census; After July 1, 1927, the two percent rule was to be replaced by an overall cap of 150,000 immigrants annually and quotas determined by "national origins" as revealed in the 1920 census. Some groups were outright banned.
Espionage Act of 1917	The Espionage Act was passed by Congress in 1917 after the United States entered the First World War. It prescribed a $10,000 fine and 20 years' imprisonment for interfering with the recruiting of troops or the disclosure of information dealing with national defence. Additional penalties were included for the refusal to perform military duty. During the Red Scare (1919-20) A. Mitchell Palmer and John Edgar Hoover, used the Espionage Act and the Sedition Act to launch a campaign against radicals and left-wing organizations. Under these two laws 1500 people were arrested for disloyalty.
Immigration Act of 1917	It established a literacy requirement and an "Asiatic Barred Zone" defined by latitude and longitude, which prevented immigration from India, Indochina, Afghanistan, Arabia, the East Indies, and other Asian countries, China and Japan being covered under separate provisions.
Johnson "Quota&" Act of 1921	Oficially established quotas for groups of people allowed to enter the country each year.