Why is Senator Joseph McCarthy famous?

AHe ran against President Truman in the 1948 election as the candidate of the anti-civil rights Dixiecrat Party.

BHe negotiated an agreement that established the state of Israel in the British-controlled territory of Palestine.

CHe worked closely with both political parties and both houses of Congress to pass the G.I. Bill of Rights.

DHe held congressional hearings that falsely accused hundreds of Americans of alleged communist sympathies.