In WW1, there was a significant amount of spying, but it proved to be of limited importance. National spy organizations had yet to be developed, so spying was still conducted as part of the various diplomatic organizations, which meant it was not coordinated or directed.
In WW2, espionage was taken to a whole new level. Huge networks of people spied for the Allies, providing enormous amounts of information of very critical importance (and, in fact, there was even spying BETWEEN the Allies, as they tried to look at each other's secrets for political gain). Unfortunately for the Axis, the compromising of the Enigma communications system meant that Axis spying was spectacularly UNsuccessful, with virtually all Axis spies being caught, or, in fact, turning out to be double agents for the Allies.
Every nation considers spying to be a crime, particularly during times of war. Their own spies are exempted, of course. It's only a crime if some other nation is doing it.
Julius and Ethel Rosenberg . ~ Look to the related link below .
Because they thought of him as a traitor for spying for Britain.
Drug use defined the 1960's!
Before World War 1, airplanes were used for recreation. However, during World War 1 airplanes were used for reconnaissance and spying on the enemies. Airplanes were also used as fighter jets and as bombers. Airplanes changed warfare greatly and allowed for blitz attacks and air warfare.
Mata Hari
Every nation considers spying to be a crime, particularly during times of war. Their own spies are exempted, of course. It's only a crime if some other nation is doing it.
To prevent them from spying or committing sabotage
Yes, that is normal practice for all major powers.
During WWII there was a fear of american Japanese spying for japan. Weary of this the government put every japanese in camps to prevent them from spying.However no Japanese american was ever convited of spying yet a few white americans where convicted of spying.
Miss Jenny was a spy for the British. She was spying on the American's and the French during the Revolutionary War.
Rosengberg
Yes. The Union and the Confederate armies both used them for spying during the Civil War.
War neuroses is another name for shell shock or post traumatic stress disorder (PTSD). War neuroses became prevalent during the first world war as it was the first major occurrence where it was documented.
There has been spying going on between nations for a long time but actual organized spying on the Soviet Union began after world war one and then really got serious after world war two.
Julius and Ethel Rosenberg . ~ Look to the related link below .
Because the leaders of Britain and USA were frightened they would be tempted to secretly fight for Japan and commit acts of sabotage and spying.