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On June 2, 1919 the front of Attorney General A. Mitchell Palmer's house was blown up by Carlo Valdinoci, a militant anarchist. https://archives.fbi.gov/archives/news/stories/2007/december/palmer_122807
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The Scopes Trial (a.k.a. "Monkey Trial") was the prosecution of a substitute high school biology teacher for teaching evolution to his students, but the trial was overturned in 1927. https://www.history.com/this-day-in-history/monkey-trial-begins
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1925 was the height of the Klan's popularity. The group had nearly 3 million members. http://allthatsinteresting.com/ku-klux-klan-march-washington
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On August 8, 1925 over 50,000 members of the KKK marched through the streets of Washington D.C. http://allthatsinteresting.com/ku-klux-klan-march-washington
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Nicola Sacco and Bartolomeo Vanzetti were two Italian immigrants. They were known anarchists who were convicted of murder and sentenced to die. On August 23, 1927 they were electrocuted, even though authorities had struggled to find evidence against them. https://www.history.com/this-day-in-history/sacco-and-vanzetti-executed