What were the cause of and reaction to red scare?

The Red Scare was primarily fueled by fears of communist infiltration in the U.S. government and society, especially after the Russian Revolution of 1917 and the rise of the Soviet Union. This anxiety was exacerbated by events such as labor strikes and the formation of radical groups, leading to a widespread belief that communism posed a direct threat to American democracy. The reaction included government crackdowns, such as the Palmer Raids, increased anti-communist sentiment, and the promotion of loyalty oaths, which contributed to a culture of fear and suspicion in the United States during the early 20th century.