I couldn't help but think how unconvincing all of Lillian Hellman's war scenes are, as though they were imagined by a grade-schooler, or even worse, a grade-school girl. No man would have written such cliched scenes: for instance, Dana Andrews' plane scene.
The despicable Hellman lets all her anti-fascist venom spill out, while she defends the equally horrific Stalinist regime.
Probably a bit late with this, but people forget the initial reactions of the non-Russian folk (Ukrainians etc) to the German invasion. They welcomed the Germans with 'bread and salt', seeing them as liberators. After being disabused of this quaint notion they took up arms to defend their 'Homeland' in the Great Patriotic War. They weren't defending the 'system' and especially not Stalin.
As to the film, in context in 1943, great propaganda, crap history. Germans take 'untermensch blut' and stick it into good Aryan boys?!! Bah humbug!
Homo homini lupus.
In fact, the Nazis were so crazy about "racial purity" that they did not have blood plasma for their wounded soldiers. This drove their doctors up a wall, because they knew they could have saved lives if they had it.
The Americans did have it.