This is a short book available online (link) which is well worth the read to anybody who wants to know how some of the modern the trouble started in the Catholic Church.
Full text of "AA-1025 The Memoirs Of An Anti-Apostle"
https://archive.org/stream/Aa-1025TheMemoirsOfAnAnti-apostle/Aa-1025TheMemoirsOfAnAnti-apostle_djvu.txt
From Amazon posted review:
AA-1025 …, a strange and fascinating account of a Communist who purposely entered the Catholic priesthood along with many others, with the intent to subvert and destroy the Church from within. His strange yet fascinating and illuminating set of biographical notes, tells of his commission to enter the priesthood, his experiences in the seminary, and the means and methods he used and promoted to help effect from within the auto-dissolution of the Catholic Church.