McCarthy warned about the infiltration and he was destroyed over it.
Curiously, after the Communist takeover of Russia, the American Government refused to recognize the new Soviet Union (under Wilson or the three successive GOP Administrations). We did not recognize it until FDR did in his first year and sent an Ambassador in 1933. “Legitimizing” them via recognition allowed for 20 straight years of deeply imbedding themselves in undermining our government and society.