1952: Supreme Court prohibits communists from teaching in US public schools.
(www.history.com)https://www.history.com/this-day-in-history/supreme-court-rules-on-communist-teachers"The New York state statute—called the Feinberg Law—banned from the teaching profession anyone who called for the overthrow of the government; the law was specifically aimed at communists. Several other states adopted similar measures. In New York, a group of teachers and parents challenged the law, and eventually the case went to the Supreme Court. The majority decision upholding the Feinberg Law, declared the New York Times, supported the belief that “the state had a constitutional right to protect the immature minds of children in its public schools from subversive propaganda, subtle or otherwise, disseminated by those ‘to whom they look for guidance, authority and leadership.'” .....
By 1952, many Americans were convinced that communist agents and supporters were actively at work within the United States, and that their forces permeated every aspect of American life. The Feinberg Law remained in force until another Supreme Court decision in 1967 declared most of its provisions unconstitutional."
