Earlier quoted context omitted.
The Poles beat the Soviets between the wars : https://en.wikipedia.org/wiki/Polish%E2%80%93Soviet_War The Germans rolled the Poles in weeks at the start of WWII. It's far from clear that without US help the Soviets could have defeated the Germans.
All countries wanted Germany to attack Soviet Union: UK, France, USA. It's not a secret. It was almost openly said that the best outcome is for Germany and USSR to weaken each other so much, that USA can join later and kill off the significantly weakened party. It didn't really matter whether Germany or USSR will win because it was assumed that the winner would be too weakened to fight one more war. USA even secretly…
All played well for western fascists until Japan sided with Germany to take over China, South East Asia and esp. Singapore. When Singapore was threatened, US changed sides. The US certainly never thought Russia will win over Germany. That was their nightmare scenario. Workers rights, socialism. This would have killed their idea of freedom of private contracts over civil rights. Workers would demand 10 hours workdays. Or even less. Workers demanding their rights couldn't just be shot down, as in the Coal wars. Smaller companies threatening the big ones could not just be eliminated by the national guard and army, as in the Texas oil war, and the Railroad commission. The German NAZi system was the big goal of the US industry. A fancy "democracy", well liked all over the world, with a bright film industry, and a beloved charismatic leader.