Surveillance cameras are installed in order to reduce crime and ensure our safety. Many people believe there is an increase in telephone tapping. Perhaps Big Brother isn't tapping your phone after all, but he may have your name on a computer somewhere. He can have all your personal data on a computer database. Military spies steal military secrets from other countries.
Industrial spies steal economic secrets, they steal modern technology.
They steal top secret information from companies through industrial espionage. They install sophisticated bugging devices. For years spies have been bugging places. But now they don't even need to bug a room. Now they can eavesdrop from outside a building, using high quality electronic equipment.