Hitler maybe, but Stalin, yes!
Hitler for sure. The American Left (which included a boatload of Jews) did support Hitler following the Ribbentrop-Molotov Pact of 1939, when Stalin and Hitler formed an alliance against the England, France, et al.
The labor unions, obedient to their real employers in Moscow, sabotaged the US arms industry with strikes, especially the Longshoremen, to prevent America from making weapons that would be shipped to England. Hollywood and the ACLU were mobilized to "oppose war" (by the Allies, that is) and protect the "persecuted" labor leaders whom Congress began investigating.
A year later, when Germany broke the pact and attacked Russia, the Left immediately became hot for war, and suddenly found bad things to say about Hitler. And as we know, after the war, they cheered Stalin's stepping into Hitler's shoes in Eastern Europe.