How did threats to internal security pave the way for McCarthy's Red Scare?

Threats to internal security, particularly the fear of communist infiltration during the Cold War, fueled public anxiety and paranoia in the United States. High-profile events like the Soviet Union's atomic bomb test and the Korean War heightened concerns about espionage and subversion. This environment of fear allowed Senator Joseph McCarthy to capitalize on public sentiment, leading to aggressive investigations and accusations against alleged communists in government and society. Ultimately, this culminated in a widespread Red Scare, characterized by paranoia and the violation of civil liberties.