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.
Yes, FDR-worship is a real pain. At least the plagiarism accusations have shut Doris Kearns Goodwin up. Haven't seen her on The News Hour lately -- blessed relief! Don't know whether you've listened to her, but she absolutely worshipped the ground FDR walked on when she was a kid, and despite her training as a historian, she's never apparently revisited her prejudices and illusions. Maybe being married to Camelot insider Dick Goodwin has had something to do with that. I'd trust her to tell me about Millard Fillmore, but the 20th century? Forget it! She sees the world through a rose-colored pair of Rooseveltian pince-nez.
Revising American history to account for the illegitimate Communist and leftist influences on American society and government, and measure their damage to our history, is going to be the major historiographical restoration job of the 21st century. The Vietnamese War alone is going to be huge.
Then, there will be the inevitable discussion: after we've reviewed all the damage, all the lies, deception, bad faith, and outright treason, we'll have to tackle the question of "what have we learned from all this, and what do we have to do to prevent its recurrence?"
The really hard part is going to be the recovery and maintenance of individual freedom and the rights and influence of our ancestors that we enjoyed in the Jacksonian Era. We will need to eliminate or domesticate the self-interested, destructive influence of economic combinations like the Millocracy and of hostile, alien ideologies like Communism, Fabian socialism, and their underground agents.