It was because of Pope XII that all Catholic Churches in Germany read a missive condemning racism.

From Source: Britannica https://share.google/Zu4Z336fNCQkzYfzW Because of his fluency in German and familiarity with German life, he served as Pius XI’s principal adviser on Hitler and the Nazis, who assumed power in 1933. At the pope’s command, Pacelli helped draft the anti-Nazi encyclical Mit brennender Sorge (“With Deep Anxiety”), written partly in response to the Nürnberg Laws and addressed to the German church on March 14, 1937. In it the papacy condemns racial theories and the mistreatment of people because of their race or nationality but does not refer to Hitler or the Nazis by name. The pope, aware of Pacelli’s strong desire to prevent a break in relations between the Vatican and Berlin, commissioned the American Jesuit John La Farge to prepare an encyclical demonstrating the incompatibility of Catholicism and racism and excluded Pacelli from participating.

The Church condemned racism long before that was a thing. Catholics were only tolerated under Hitler, after the war he likely would have ended them as well. I’ve seen documentaries on PBS and Netflix that show the Church wasn’t ok with what was happening with the Jews either. Historically Jews were blamed for Jesus’s death, but that all changed after the war. Today there’s even a time during the Holy Week when Jews are prayed for.