How did Joseph McCarthy contribute to the red scare after world war ii?

Joseph McCarthy significantly contributed to the Red Scare after World War II through his aggressive campaign against alleged communists in the U.S. government and other sectors. He famously claimed to have a list of communists within the State Department, which fueled public fear and paranoia about communist infiltration. His hearings and accusations led to widespread investigations, blacklisting, and the tarnishing of many reputations, creating an atmosphere of fear that stifled dissent and curtailed civil liberties during the early Cold War era.