There are different kinds of tactics. The tactic used in the early 1950's is described in this question is McCarthyism.
<h3>What was McCarthyism?</h3>
McCarthyism is the known to be a practice of making some kind of accusations of subversion and treason, mostly to those who are related to communism and socialism.
The Warren Court is said to have made a lot of rulings on civil and political rights that overturned a lot of McCarthyist laws and directives, and helped end the reign of McCarthyism.
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The answer to number one is because they wanted to stop the spread of communist propaganda. The answer for number two is they would lose their jobs, separated from the community, abused verbally and physically, shunned, lost friends, and even family members.
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