That's true, Stalin was not yet our enemy.
And the left, except for the communist left of course, were not in any way radical the way they are today.
This is a whole other world, isn't it?
They were getting their marching orders from Stalin and Stalin was telling them to support the war effort against Hitler.
Further proof of that is offered in Ann Coulter's book Treason as well as elsewhere. Until Hitler stabbed Stalin in the back by invading Russia in the summer of 1942 Stalin was telling his minions in the U.S. to oppose the war effort. They turned on a dime (at Stalin's orders) to support the effort once Hitler turned on Stalin.
It's hard for me to even conjure up a scenario whereby the same type of thing could happen again. Yes, it's a very different world now.