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Public hysteria grew due to international events such as The communist takeover in China by Mao Zedong, The Soviet Union’s successful development of the atomic bomb, and the start of the Korean War.

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J. Edgar Hoover aided many of these investigations and his agency began extensive measures on suspected communists (wire taps, surveillance, invasion of leftist groups, etc.)

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Suspected communists and left sympathizers were blacklisted by several industries

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- World War I, which led many to embrace strong nationalistic and anti-immigrant sympathies

- The Bolshevik Revolution in Russia, which led many to fear that immigrants

- The end of World War I, which caused production needs to decline and unemployment to rise.

- Self-proclaimed anarchists' mailing bombs to prominent Americans

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Most of their investigations were focused around the Hollywood movie industry and the federal government, more specifically, communists and left sympathizers

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House Un-American Activities Committee (HUAC) was formed in 1938 in order to investigate potential disloyalty in the United States. The program became much more popular after WW2, during the cold war.

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It’s called the Red Scare because people were afraid of potentially radical communists and what harm they could bring to the US. Red is associated with the Soviet Union’s flag, which was a huge communist nation, and still is today.

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They were able to collect around 10,000 suspected people, gave many of them trials to prove so, and were able to deport suspicious foreigners.

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In 1919, Attorney General A. Mitchell Palmer and Head of the General Intelligence of the Justice Department J. Edgar Hoover reacted to the potential threat of radical communists in the country by going and raiding labor union offices and searching private homes without warrants.