What is the best statement of the 2nd Red Scare of Conformity?

The correct answer to this open question is the following.

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A statement that could describe the Second Red Scare and McCarthyism is "a time in US history when Senator McCarthy used of accusations, blacklisting, and investigations against suspected communists."

We are referring to Wisconsin Republican Senator Joseph McCarthy who in those Cold War years accused that many members of the US federal government and the US military were supporting Communist activities in the mid-1950s. McCarthy just accused people but never offer a serious argument or proof, so he ended up being a liar and his political career ended.

when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.