According to Sun Tsu's Art of War; Spies are a necessity of war. Spies have been used since war's have been fought. Note* the penalty for getting caught as a spy is death.
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Nationalism did play an important role in the cold war. There are certain individuals who offered to work as spies for their countries.
The cold war by definition was not a "war" but many spies die collecting information on the positions of nuclear long rangemissile.this is my best answer you may want to look father.The cold war turned into a "Hot" war in Korea and Vietnam.
Yes - even the women spies.
Some spies were women, who were not readily seen as being involved in the war.
During the US Civil War, espionage was a factor in gaining information about both the North & South. The South had spies in Washington DC and the North had spies in Richmond, Virginia.