On 30 July 2012, The Jewish Daily Forward published Professor John Connelly's essay, 'Converts Who Changed the Church.'

This said, part:

Despite opposition from within their ranks, the bishops knew that they could not be silent on the Jews. When the document stalled in May 1965, one of them explained why they must push on: 'THE HISTORICAL CONTEXT: 6 MILLION JEWISH DEAD…

As I discovered while researching my recently published book, 'From Enemy to Brother: The Revolution in Catholic Teaching on the Jews, 1933–1965,' these experts did not begin their work in the 1960s. From outposts in Austria and Switzerland, several had tried to formulate Catholic arguments against anti-Semitism under the shadow of Nazism three decades earlier. They were as unrepresentative of Catholicism as one can imagine. Not only were they, Central Europeans, brave enough to stand up to Hitler when it counted, but THEY MOSTLY HAD NOT BEEN BORN CATHOLIC. THE CATHOLICS WHO HELPED BRING THE CHURCH TO RECOGNITION OF THE CONTINUING SANCTITY OF THE JEWISH PEOPLE WERE CONVERTS, MANY OF THEM FROM JEWISH FAMILIES.
More here: THE ENEMY WITHIN: Jewish converts who changed the Catholic Church