fifth column

Noun
  1. A subversive group that supports the enemy and engages in espionage or sabotage;
    An enemy in your midst (synset 108376680)
    is a type of: social unit, unit - an organization regarded as part of a larger social group
    member holonym: fifth columnist, saboteur - a member of a clandestine subversive organization who tries to help a potential invader
    same as: trojan horse

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