Why was Senator Joseph McCarthy's anti-communist crusade brought to an end?

His investigations of communists were not permitted under federal law.
His investigations revealed that his own aids were communists.
His investigations found that communists had infiltrated the executive branch
His investigations of the military were nationally televised.

Why was the sixteenth amendment important to woodrow wilson’s efforts to regulate the economy? a) the sixteenth amendment lowered interest rates charged by banks. b) the sixteenth amendment allowed congress to levy an income tax c) the sixteenth amendment lowered tariffs on imported goods d) the sixteenth amendment allowed congress to break up monopolies