Pacelli presided as Papal Legate over the International Eucharistic Congress in Buenos Aires , Argentina in 10 – 14 October 1934 , and in Budapest in 25 – 30 May 1938 . At this time , anti-semitic laws were in the process of being formulated in Hungary . Pacelli made reference to the Jews " whose lips curse Christ and whose hearts reject him even today " . This traditional adversarial relationship with Judaism would be reversed in '' Nostra aetate '' issued during the Second Vatican Council . According to Joseph Bottum , Pacelli in 1937 " warned A. W. Klieforth , the American consul to Berlin , that Hitler was ' an untrustworthy scoundrel and fundamentally wicked person ' , to quote Klieforth , who also wrote that Pacelli ' did not believe Hitler capable of moderation , and ... fully supported the German bishops in their anti-Nazi stand ' . This was matched with the discovery of Pacelli 's anti-Nazi report , written the following year for President Roosevelt and filed with Ambassador Joseph Kennedy , which declared that the Church regarded compromise with the Third Reich as ' out of the question ' . " Historian Walter Bussmann argued that Pacelli , as Cardinal Secretary of State , dissuaded Pope Pius XI — who was nearing death at the time — from condemning the '' Kristallnacht '' in November 1938 , when he was informed of it by the papal nuncio in Berlin
Kristallnacht
Kristallnacht
Pope Pius XII