• [A fifth] column is a group of people who clandestinely [undermine] a larger group such as a nation from within. A fifth column can be a group of secret sympathizers of an enemy that are involved in sabotage within military defense lines, or a countrys borders. A key tactic of the fifth column is the secret introduction of supporters into the whole fabric of [the entity] under attack.


    Fifth columnist meaning & definition 1 of Fifth columnist.

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