Catholics have never been forbidden to read the Bible. It was the Catholic Church that canonized and commissioned the production of a Bible in the common language of Europe in the 4th century. Although some heretical translations were prohibited, no Bible accepted by any mainstream Protestant denomination today was ever on the list.
For the record, Fr. John Courtney Murray was silenced not because of his position on eccumenicalism but because of his advocacy for birth control and abortion and toleration of politicians who supported it.
The Church has always been an advocate for religious liberty because it has so often been the victim of those opposed to it.
Peace be with you.
In the late 1940s Murray began to grapple with the problem of how the beliefs of a pluralistic, democratic society such as that of the United States could be integrated into the teachings of the Roman Catholic church. Murray was an outspoken opponent of censorship on the part of the Vatican, and, indeed, was opposed to any effort by the church to bring about change within states by means other than moral persuasion. Many of his writings on these topics first appeared in Theological Studies, a quarterly journal published by Woodstock College, of which Murray became editor in 1941. By the mid-1950s he was forbidden by the Jesuit order to write on topics pertaining to religious freedom and issues of church and state...
So, it would seem that advocating religious freedom led to John Courtney Murray being censored by the Catholic Church. Rather odd, wouldn't you say, if your characterization is correct?