The Fifth Column of Fox News

Fifth Column:

A fifth column is any group of people who undermine a larger group from within, usually in favor of an enemy group or nation. The activities of a fifth column can be overt or clandestine. Forces gathered in secret can mobilize openly to assist an external attack. This term is also extended to organised actions by military personnel. Clandestine fifth column activities can involve acts of sabotage, disinformation, or espionager executed within defense lines by secret sympathizers with an outside force.  — Wikipedia