Multiple choice Which of the following best describes the significance of Joseph McCarthy? Senator who accused prominent figures of being Communists Senator who opposed US involvement in United Nations Senator who supported amnesty for illegal immigrants Senator who opposed US involvement in League of Nations Reveal answer Fill a bubble to check yourself A Correct answer Explanation Joseph McCarthy was a US Senator who led a campaign against alleged Communists in the US government during the early 1950s, a period known as McCarthyism.