The Allies called him Garbo. The Nazis dubbed him Alaric. Both sides in World War II were sure Juan Pujol Garcia was their man. In reality, Pujol was a double agent and his final allegiance was to the Allies. From the relative comfort of Lisbon, Garbo fed false information to the Nazis and fabricated a network of phantom agents across Europe. Although he never fired a single shot, Garbo helped to save thousands of lives, most notably by misinforming...