There were also real Communist agents. See https://en.wikipedia.org/wiki/Venona_project https://en.wikipedia.org/wiki/Venona_project https://en.wikipedia.org/

There were also real Communist agents. See https://en.wikipedia.org/wiki/Venona_project https://en.wikipedia.org/wiki/Venona_project https://en.wikipedia.org/wiki/Klaus_Fuchs https://en.wikipedia.org/wiki/Klaus_Fuchs https://en.wikipedia.org/wiki/Julius_and_Ethel_Rosenberg https://en.wikipedia.org/wiki/Julius_and_Ethel_Rosenberg There were also real, devastating consequences to Communist ideology. See https://en.wikipedia.org/wiki/Holodomor https://en.wikipedia.org/wiki/Holodomor https://en.wikipedia.org/wiki/Great_Chinese_Famine https://en.wikipedia.org/wiki/Great_Chinese_Famine https://en.wikipedia.org/wiki/Cambodian_genocide https://en.wikipedia.org/wiki/Cambodian_genocide for three examples.