Yes, I knew Ball and Bacall grew up in NY. I know the communist starting place targets were Hollywood, the Catholic Church and Academia. And, stoking the lower working classes, unions, etc.
There must have been an ARMY of them, if 1500 pretty boys were slipped into Seminaries alone. Think of the numbers of targets just in universities.
I believe I heard a story once (probably here at FR) to the effect that when Stalin was told how easy it was to emigrate to the United States, he immediately asked "why don't we put 50,000 spies in there?"