2011 article Stasi’s West German informant records. Pope Benedict mentioned. I wonder if blackmail may have led to his early “retirement”.
“Under the code name "Erich Neu," the pastor is believed to have submitted 95 informant's reports, including ones on a colleague who even at the time showed a great deal of potential: Joseph Ratzinger, better known today as Pope Benedict XVI. Frindt, who studied and later taught in the city of Münster, delivered information on up-and-coming theologians and future church dignitaries there, including the future pope, who was working at the time as a professor.“
http://m.spiegel.de/international/germany/shocking-new-research-stasi-had-thousands-of-spies-in-west-germany-a-799335.html