International Committee of the Red Cross
By the end of the war, 179 delegates had conducted 12,750 visits to POW camps in 41 countries. The Central Information Agency on Prisoners-of-War (Zentralauskunftsstelle für Kriegsgefangene) had a staff of 3,000, the card index tracking prisoners contained 45 million cards (more than 6 times as many as world war 1), and 120 million messages were exchanged by the Agency.