As a matter of fact I know of the Rat Lines. It was one of the darker and more shameful periods of the Catholic Church. That said, what happened should be analysed in context: many of those who were saved through the Rat Lines deserved to face justice. But many others, who were innocent, would have been slaughtered by Stalin's Communists or Tito's Partisans, simply because they were Catholic and regardless of their actual roles during the War.