How did the russian revolution lead to the “red scare” in the U. S.?

The First Red Scare's immediate cause was the increase in subversive actions of foreign and leftist elements in the United States, especially militant followers of Luigi Galleani, and in the attempts of the U.S. government to quell protest and gain favorable public views of America's entering World War I

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the answer is b just took the test

) the chinese armed forces had been removed from the city