Final answer:
The Red Scare of the 1920s in the United States was characterized by fears of leftist revolution and communism, exemplified by events such as the Russian Revolution and the trial of Sacco and Vanzetti.
Explanation:
The Red Scare in the 1920s was fueled by fears of leftist revolution and communism, largely influenced by events like the Russian Revolution of 1917. The trial of Italian immigrants, Sacco and Vanzetti, further exemplified the widespread fear of foreigners during this period. Government actions such as the Palmer Raids and the Smith Act were undertaken to suppress socialist and communist voices, leading to a climate of fear and suspicion.
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