dirty war

Short definition from Wiktionary

Noun

1. 1
   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.

Proper noun

1. 1
   The period of state terrorism in Argentina from 1974 to 1983 as a part of Operation Condor.