We don't have any synonyms for dirty war yet.
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Definition of dirty war:
(n) :
(historical) A conflict (particularly one in South America) between a dictatorship against leftist revolutionaries or activists, typically characterized by extrajudicial repression like kidnapping, torture and enforced disappearance.
(n) :
(historical) The period of state terrorism in Argentina from 1974 to 1983 as a part of Operation Condor.