The world map would look different today if Richard Sorge hadn´t spied the war strategies of Japan. And if the British hadn´t finally broken
Germany´s Enigma messages, vital support from United States would have ended at the bottom of the Atlantic instead of Europe.

In espionage one person or device can have a big impact on the course of history.

These people and devices deserve to become known although espionage is very often a suspicious underground action.