Not surprising. FDR was president. Until Hitler stabbed his little buddy Stalin in the back, the left loved him.
Remember Bella Abzug - the Commie from New York with the Big Hat? She was one of those.
There was the little matter of the Spanish Civil War (1936-1939). The Soviets were selling arms - and promoting the recruitment of international commie volunteers - to the side that the nascent Luftwaffe was opposing. So it wasn’t as simple as NAZI = socialist = good guy even before the invasion of the USSR. Although, the Daily Worker did editorialize in favor of the NAZIs to such an extent that when Hitler invaded, the DW had screaming denunciations of Hitler in part of the next edition of the paper - and a holdover editorial in favor of Hitler elsewhere in the same paper.