I believe the Venona decrypts revealed some 300 Soviet agents(by code name) at least 150 of which were identified by actual name. Yet, I doubt even 10 of those individuals were ever prosecuted. That, supposedly represents some kind of “Red Scare”, witch hunt or anti-Communist hysteria; more than a hundred traitors and dedicated enemy agents are allowed to go free, live comfortable lives on government and university pensions and in the following years, continue their treachery by actively undermining our efforts in Vietnam.
I knew an elderly man in the early 90s who I was told was a Communist spy during the 30s - 50s. I tried to find out the truth but never did get to the bottom of it. But a year before he died, the subject of spies came up and we were talking about people like Larry Adler, etc. and this man said in a whisper: “they never caught the real spies.” I believed him.