Money quote:
According to a letter from Nov. 20, 1946, published this week in the Italian newspaper Corriere della Sera, the wartime pope, Pius XII, said that children who had been baptized while in the church’s guardianship should not be reunited with surviving members of their families.This is an old trick, and it is a practice sanctioned by Popes for 100s years, a practice that amounts to the kidnapping of Jewish children -- usually because somebody reported having baptized them without their parents' knowledge
If you find this subject facinating and horrifying (I do) consider reading this book.