I am ashamed to say it, but the Allies knew about the holocaust and did nothing to stop it because of the resource drain it was on the Axis. The victims represented another potential 3 million Axis troops and tens of thousands of educated professionals. in the big picture they were expendable and the Popes efforts to save them ran counter to Allied interests.
I am afraid our history of the 20th Century Wars (along with all American history) has been largely revised by the Marxists in academia. Our curricula in schools and publishing outlets are controlled by an elite few who only allow the Marxist viewpoint and destroy, disparage, or eliminate other viewpoints.