There is a most interesting article in National Review Online by Ion Mihai Pacepa, (Wikipedia article) the "highest ranking intelligence officer ever to have defected from the Soviet bloc." Entitled Moscow’s Assault on the Vatican, he tells the story of how the KGB set out to discredit Pope Pius XII and were behind the play The Deputy.
Amy Wellborn's post Is this for real? has a discussion in the combox. One point is worth mentioning - have you seen anything about this in the news? No, I didn't think so.