There were quite a few of FDR’s inner circle that were fellow travellers or sympathizers. A book by the name of “FDR’s Folly” gives a pretty good account of the leanings of the big wheels in that administration. It describes how FDR’s policies not only did not help cure the Depression, but actually made it worse.
FDR and his "helpers" put the US solidly on the path to its current policy of domestic socialism, as well as its internationalism which have questionable American "national interest" - e.g., Clinton's Bosnia, from which the US will never recover.