What was the context of Joseph McCarthy's wheeling speech?

Joseph McCarthy's Wheeling speech, delivered on February 9, 1950, in West Virginia, marked a significant moment in the Red Scare and the anti-communist hysteria of the era. In this speech, McCarthy claimed to have a list of known communists working within the U.S. government, alleging widespread infiltration and espionage. His accusations fueled public fear and paranoia about communism, leading to a period of intense scrutiny and persecution of individuals suspected of disloyalty. The speech effectively launched McCarthy's campaign against alleged communists, significantly shaping American politics and society during the early Cold War.