Cause of the Red Scare

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The Bolshevik Revolution in Russia, which led many to fear that immigrants, particularly from Russia, southern Europe, and eastern Europe, intended to overthrow the United States government;

Second Red Scare

After World War II, the second Red Scare happened due to a fear of communist espionage. In the midst of the Berlin Blockade, a Soviet Eastern Europe and both the Korean and Chinese Civil War, people were very afraid of the threat of communism. The fact that a couple of American government officials, some with high ranks, confessed that they used to spy for the Soviet Union, did not help either.

Red Scare

Red Scare happens when the fear of radical leftism or communism is promoted, often in the media.

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Self-proclaimed anarchists' mailing bombs to prominent Americans, including United States Attorney General A. Mitchell Palmer and United States Supreme Court Associate Justice (and former Massachusetts Supreme Judicial Court Chief Justice) Oliver Wendell Holmes, Jr.

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The end of World War I, which caused production needs to decline and unemployment to rise. Many workers joined labor unions. Labor strikes, including the Boston Police Strike in September 1919, contributed to fears that radicals intended to spark a revolution;

First Red Scare

The first Red Scare in the U.S. happened just after the 1917 Bolshevik Revolution and during WW1, when people were very patriotic and social agitation of left-wingers further aggravated the political, national and social tensions. A belief lived among the Americans that a Bolshevik worker revolution in the U.S. was imminent.

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