Spying is nothing new to the world. History books tell us that ancient civilizations like the Roman Empire, Egypt, Chine, India, and so on used it. On top of that, 1900s regimes like the Former Soviet Union and Nazi’s Germany used spying tactics around the world wars. The main use of spying at that time mostly was for political and military advantage. These countries were successful on spying. However, in the 21st century surveillance is used in different and very complicated way. So many crimes