That would be Pius XII.
I recently attended a lecture given by Ronald Rychlak, author of the brilliant defense of Pius XII, Hitler, the War and the Pope. It is truly stunning the bald faced lies which are told by the Left regarding Pius XII.
Pius XII. A man so pro-Nazi that he was hated and feared by the actual Nazi hierarchy and was lavishly praised by virtually all of his notable Jewish contemporaries for his actions against the Nazis.