Definitions for fifth column
Random House Webster's College Dictionary
a group of people who act traitorously and subversively out of a secret sympathy with an enemy of their country.
(originally) Franco sympathizers in Madrid during the Spanish Civil War: the insurgents had four columns marching on Madrid and a “fifth column” of supporters already in the city.
fifth column, Trojan horse(noun)
a subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst
A group of people which clandestinely undermines a larger group, such as a nation, to which it is expected to be loyal.
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