What is the best evidence that cold war fears affected american civil liberties during the 1950s?

McCarthy Senate hearings

Explanation:

The cold war period has a significant effect on the lives of Americans. As the threats of spreading communism was used by the people to defame and harass their opponents. In February 1950 Senator McCarthy accused the Department of State of having more than 200 communists. By 1954 his power began to fade as there were no concrete pieces of evidence to support his claims.

basic principles: federalism, separation of powers, checks and balances, judicial review, representative democracy, limited government, rule of law, individual rights and responsibilities, consent of the governed, majority rule, popular sovereignty, equal protection.