Learn how the U.S. government cracked down on terrorism threats and left-wing activism in America during the “Red Scare” of 1919–1920, in the wake of the Bolshevik Revolution in Russia, in these videos adapted from AMERICAN EXPERIENCE: The Bombing of Wall Street. As a wave of anti-capitalist uprisings swept through Europe and elsewhere, activists in the United States planted the seeds of revolution at home. In response to a series of bomb attempts, U.S. Attorney General A. Mitchell Palmer formed a new intelligence unit, the “Radical Division,” to keep tabs on potential threats. Led by J. Edgar Hoover, the unit launched raids against suspected radical groups. Thousands of people, immigrants and American citizens alike, were detained, often without warrants or specific cause. Many of them were deported to Russia.