By the way, it was not the USSR's U.S. spies that damaged us so much, as the USSR's British spies. The British intelligence agencies were honeycombed with Russia spies. And to this day, the we know most the KGB spies, but only the tip of the iceberg about GRU spies. I don't think the U.S. intelligence services have recovered to this day.
Otherwise, the liberals who were demonizing him that fomented this thread complained that he tried to start WWIII over Soviet Russia.
You are missing the big picture. A possible confrontation with the USSR in 1945 would not have been necessary, if Churchill didn't have the U.K. and U.S. acting as their Maitre De of the Russia war machine.
The U.S. and U.K. fed and raised what became the rampaging war machine of 1945. We subordinated our own interested to bail them out.
True, their were Soviet plants near FDR, but they weren’t the ones who steered FDR into going easy on the USSR, it was Churchill. He forced the U.S. to cater to Stalin’s every desire.
FDR was the one who put Alger Hiss in charge of the negotiations, not Churchill. You can debate whether the Venona Papers were conclusive or not, but not Hiss’ stance in giving away Eastern Europe, and other breaches of faith.