Noticed a lot of anons with info dumps on the post Vatican II church.
For some deep background and good data, you need this collection of The Sword Of Truth, the Roman Catholic Letters of Mary R. Lejeune from 1964- 1985. She was one of the first people to see the corruption and understand what was happening.
PDF file here:
https://betrayedcatholics.com/wp-content/uploads/2012/02/Lejeune.pdf