I have heard that narrative before and have the Dodd book, Bella V. Dodd, School of Darkness, New York: Angelico Press, 2017.
I read a small book years ago, I think by TAN, on the issue of communist plants in the Church.
One very effective way to ensure against that is by requiring and enforcing the celibacy and doctrinal integrity of all of our candidates to the priesthood and to any position of authority in the Church, as required by Canon Law, Canon 521!
Cf. 1 Timothy 3:1-13 (The Epistle for the Mass today, Tuesday of the 24th Week of Ordinary Time, Week I).