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agent provocateur noun

  /ˈeɪ.dʒənt ˌpɹəʊ.vɒk.æ.tʊə(ɹ)/
  • A person who secretly disrupts a group's activities from within the group, particularly by encouraging or committing illegal acts to discredit the group or expose them to prosecution; an instigator, troublemaker.
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