What caused the red scarce in the US in 1920?

The Red Scare in the U.S. during 1920 was primarily driven by fears of communism and anarchism following the Russian Revolution of 1917. The rise of labor strikes, particularly the Seattle General Strike and the Boston Police Strike, heightened public anxiety about potential radical uprisings. Additionally, the influx of immigrants from war-torn Europe contributed to suspicions of socialist and communist sympathies among the populace. This culminated in widespread government crackdowns on perceived radicals, exemplified by the Palmer Raids.