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The Alien and Sedition Acts were a set of four laws enacted in 1798 that applied restrictions to immigration and speech in the United States.

The Naturalization Act increased the requirements to seek citizenship, the Alien Friends Act allowed the president to imprison and deport non-citizens, the Alien Enemies Act gave the president additional powers to detain non-citizens during times of war, and the Sedition Act criminalized false and malicious statements about the federal government.

The Alien Enemies Act has been invoked several times since, particularly during World War II. The Alien and Sedition Acts are generally received negatively by modern historians, and the U.S. Supreme Court has since indicated that aspects of the laws would likely be found unconstitutional today.

It's been invoked three times: War of 1812, WWI and WWII.

Last used in WW2 to put Japanese-Americans in concentration camps.