infiltrator

Noun
  1. Someone who takes up a position surreptitiously for the purpose of espionage (synset 110225452)
    is a type of: spy, undercover agent - (military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors
  2. An intruder (as troops) with hostile intent (synset 110225333)
    is a type of: interloper, intruder, trespasser - someone who intrudes on the privacy or property of another without permission

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