I want to know the answer to the following question:
What group did Montini oppose reforming?
All the background I'm provided with is that "Montini and Angelo Roncalli were considered to be friends, but when Roncalli, as Pope John XXIII announced a new Ecumenical Council, Cardinal Montini reacted with disbelief and said to Giulio Bevilacqua: "This old boy does not know what a hornets nest he is stirring up."". Is that enough to answer the question?
Answer: yes