My father, who was a career active-duty USAF Reservist (1950-62, a "retread" for Korea), told me about some of that stuff back in the 1950's. It was common knowledge in the Air Force that Hopkins and Harry Dexter White had been solid red, and that they'd sent nuclear materials over the pole to the USSR in the 40's, but nobody could do anything about it. Some USAAF officer who'd tried to stop a shipment up in Montana or Idaho or someplace had had a can tied to his ass by Hopkins personally, the story went.
There was never any doubt in my dad's mind that McCarthy had been right, but that The Club had hated his guts and ridden him down because he'd tried to crash the party uninvited. Not that they had anything against drunks, but that didn't stop them from telling everyone else about it.
This knowledge weighed on my dad's and other people's minds a lot in the 50's and contributed greatly to the atmosphere of pessimism and worry that dominated the era. But media types never talk about that.
As one of FDR's favourites, during the CCC days, if you were not/nor would not "register to vote" as a Democrat - you were blackballed from CCC, WPA, ... work.
As Hopkins was head of the Lend-Lease program, and was Soviet Agent 19 as identified via the Venona work, it is little wonder that Stalin got more and more ...
As is the case in most of American education - this "history" (as Tehran, Yalta) is never addressed - FDR's legacy is too dear!!!
As an FYI, See "Dark Sun - The Making of the Hydrogen Bomb" by Richard Rhodes (Simon $ Schuster, New York, 1995, ISBN 0-684-80400-X), Chapter Five "Super Lend-Lease." Pages 99-100 lists the nuclear materials; there also is a commentary by General Groves.
It was even common knowledge that Eleanor Roosevelt was a dedicated communist,but nobody really cared. She even went so far as to have several communists being investigated by Congress stay at the White House after they were supoened to testify before the House Un-American Activities Committee. They would get up in the morning,eat breakfast at the WH,and then be driven to the hearings in the WH limo.When the hearings were over for the day,they all rode back to the WH for dinner and sleep. This went on for about 3 months. Eleanor often sat directly behind them to show her support,and there was even a photo that took up most of the front page of the Washington Post showing her sitting there.
So much for "America's Greatest Generation". What they cared about was a chicken in every pot,and to hell with freedom. How else could Roosevelt have kept getting elected?