The book by the Polish priest on Catholic clerical collaboration with the Polish Communist regime, that is. John Allen:

Zalewski identifies thirty other clerics as onetime informants, among them four bishops. Yet he also names a number of prominent Polish clergymen who he says spurned Communist overtures, including Cardinals Franciszek Macharski, formerly of Cracow, and Andrzej Deskur, a longtime Vatican official.

Zalewski has long been among the leaders of a drive to expose clergy who supplied information to authorities. The church, he says, must confess and repent.

“The church’s avoiding of the problem could lead to irreversible harm,” he wrote in an introduction. “Above all, it will cast a shadow on those clergy (and they were the vast majority) who never cooperated with the secret police.”

“Most priests,” Zalewski writes, “exited the Communist era with their heads held high.”