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Wiktionary:
1. close observation of an individual or group; person or persons under suspicion
3. (military, espionage) systematic observation of places and people by visual, aural, electronic, photographic or other means
4. (law) in criminal law, an investigation process by which police gather evidence about crimes, or suspected crime, through continued observation of persons or places

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https://en.wikipedia.org/wiki/Surveillance

https://en.wikipedia.org/wiki/Computer_and_network_surveillance

https://en.wikipedia.org/wiki/Mass_surveillance_in_the_United_States

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