名詞: n.
In United States history, the term Red Scare denotes two distinct periods of strong anti-communism: the First Red Scare, from 1917 to 1920, and the Second Red Scare, from 1947 to 1957. The Scares were characterized by the fear that communism would upset the capitalist social order in the United States; the First Red Scare was about worker revolution and political radicalism. The Second Red Scare was focused on (national and foreign) communists infiltrating the federal government.
Shortly after the end of World War I and the Bolshevik Revolution in Russia, the Red Scare took hold in the United States.