Why were Americans afraid of the red scare?

Americans were afraid of the Red Scare due to the fear of communism spreading in the United States, particularly after the Russian Revolution of 1917 and the rise of the Soviet Union. This anxiety was fueled by events such as labor strikes, bombings, and the perceived threat of communist infiltration in government and society. The fear of losing democratic freedoms and the influence of radical ideologies led to widespread paranoia, resulting in political repression, blacklisting, and the violation of civil liberties during the McCarthy era.