fifth columnist

Noun
  1. A member of a clandestine subversive organization who tries to help a potential invader (synset 110107024)
    is a type of: traitor, treasonist - someone who betrays his country by committing treason
    belongs to: fifth column, trojan horse - a subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst
    same as: saboteur

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