Why was the era of McCarthyism called the red scare?

The era of McCarthyism, occurring in the early 1950s, was called the Red Scare because it was characterized by widespread fear of communism and the perceived threat of communist infiltration in American society and government. Senator Joseph McCarthy led efforts to root out alleged communists, often using aggressive tactics that included public accusations and investigations. This climate of fear and suspicion led to blacklisting, loss of employment, and violations of civil liberties, as many Americans were unjustly targeted as potential communists, or "reds." The term "Red" refers to the association of communism with the color red, symbolizing its ideological roots.