At the Archway of Bells, the main entrance to Vatican City, the unfamiliar guest had to show his special pass to the Swiss Guards. Once admitted, however, he was whisked to the Apostolic Palace and received by Pope Paul VI in a private, 50-minute audiencetwice as long as the pontiff normally gives, and longer than the audience granted to John F. Kennedy. The visitor: Italy's tough old Socialist Party chieftain, Pietro Nenni, 74, an unregenerate unbeliever and onetime Stalin Prizewinner.
Dark Mutter. Rome was startled, and with reason. "Nenni is the first Italian Socialist to pass through the doors of the Vatican,"...