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Subversion () refers to a process by which the values and principles of a system in place are contradicted or reversed in an attempt to sabotage the established social order and its structures of power, authority, tradition, hierarchy, and social norms. Foreign subversion refers to "hostile meddling in a rival’s domestic politics, against the wishes of the existing regime, in order to weaken it or change its foreign policy." Foreign subversion tends to be covert rather than overt. Foreign subversion is generally perceived to be a hostile attack.