Let me tell an ugly little secret about the America First movement having socialists and commies in their ranks: they were ordered to be that way by Stalin. From 1933-39, you would hear nothing but "smash fascism", "stop the Nazis" etc. from the CPUSA and their more moderate allies. Then the Molotov-Ribbentrop Pact was signed. Literally overnight, the American hard left became anti-war and isolationist. They were the loudest voices saying Britain should throw in the towel by 1940, saying the US should not involve itself and cut off lend-lease, quickly becoming opponents of FDR who kept giving money and arms to the UK. And to show they had no morals or spine, by noon on June 22nd, 1941, they were the most rabid, pro-war, send whatever the US could to Britain and the Soviets especially.
Not that you'll ever hear about that. After all, it literally took the Iron Curtain falling to finally get the Russians to admit they signed a secret agreement with the Nazis in 1939. And you'll certainly never hear it from the living Dunning-Kruger victims that make up HoI4 modding, especially KaiserSyndiewank.
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(Literally from a day after the M-R Pact was signed. From the Washington Commonwealth Federation rag.)