More ignorance - all bishops knew - in 1962, all the bishops in the world received from the Vatican Crimen Solicitationes - which laid out in detail and what to do.
Prior to that, Rev. Gerald Fitzgerald had submitted a report to Pius XII:

http://www.awrsipe.com/Doyle/2011/2011-01-11--paraclete_report.htm

Highlight:

In 1950 Fr. Gerald wrote to Bishop Buddy of San Diego and told him that for the first time in the community's three year history the main monastery, known as Via Coeli (Way to Heaven) was filled to capacity and had to turn a priest away. He went on to state that at that time there were priests from 35 U.S. dioceses and 9 religious communities at Via Coeli.   
Fr. Gerald had a very negative opinion of priests who sexually abused minors. In the 1950's he wrote to a number of bishops asking if they had an island in their dioceses where he could establish a totally isolated facility to permanently house such priests.