#surveillance  close observation of a person or group
  supertype:  investigating__investigation  the work of inquiring into something thoroughly and systematically
  subtype:  electronic_surveillance  surveillance by electronic means (e.g. television)
  subtype:  watch__vigil  a purposeful surveillance to guard or observe
     subtype:  listening_watch__listeningwatch__continuous_receiver_watch  a watch established for the reception of traffic of interest to the unit maintaining the watch
     subtype:  spying  keeping a secret or furtive watch
  subtype:  stakeout  surveillance of some place or some person by the police (as in anticipation of a crime)

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