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The moral panic about supposedly unpatriotic educators was driven by international war hysteria combined with agitation over the growing domestic political strength of teachers unions. In 1917 and 1918, Congress passed the Espionage and Sedition Acts, which sought to ban public speech and actions “disloyal” to the United States military and government, especially among socialists, communists, pacifists, immigrants, and other groups perceived as affiliated with European leftism. More than any other force, the American Legion, a veterans’ organization, pushed this ethos of unquestioning patriotism onto the nation’s public schools. The Legion was influential: 16 U.S. senators and 130 congressmen identified as members. It promoted the idea that the Communist Party in Moscow actively recruited American teachers in order to enlist them in brainwashing the nation’s youth. The Legion saw all left-of-center political activity as unacceptably anti-American.
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Dana Goldstein (The Teacher Wars: A History of America's Most Embattled Profession)