What gains for comminism around the world created the fear that set the stage for the excesses of mc carthyism?

The rise of communism in the early to mid-20th century, particularly following the Bolshevik Revolution in Russia (1917) and the establishment of communist regimes in Eastern Europe and China, fueled fears of a global communist threat. The perception that communism was gaining traction, combined with events like the Korean War and the Soviet Union's development of nuclear weapons, intensified anxieties in the United States. This atmosphere of fear and paranoia about communist infiltration and espionage led to the excesses of McCarthyism, where accusations and investigations often targeted innocent individuals, undermining civil liberties and promoting a culture of suspicion.