A group of people which clandestinely undermines a larger group, such as a nation, to which it is expected to be loyal
people willing to cooperate with an aggressor against their own country, secret supporters of an enemy that engage in espionage or sabotage against their own country
a group of people who work secretly to help the enemies of the country where they live or the organization in which they work columnist
a subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst
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