The Scarlet and the Black (1983)

Fr. Hugh O'Flaherty is a Vatican official in 1943-45 who has been hiding downed pilots, escaped prisoners of war, and Italian Resistance families. His diplomatic status in a Catholic country prevents Colonel Kappler from openly arresting him, but O'Flaherty's activities become so large that the Nazis decide to assassinate him the next time he leaves the Vatican. O'Flaherty continues his work in a variety of disguises. Based on a true story.