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In page Dirty War:

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The exact chronology of the repression occurring before the Operation Condor's beginning in March 1976 is still debated, but some sectors claim the long political conflict started in 1969 as individual cases of state-sponsored terrorism against Peronism and the left can be traced back to the bombing of Plaza de Mayo and Revolución Libertadora in 1955. The Trelew massacre of 1972, the actions of the Argentine Anticommunist Alliance since 1973 and Isabel Martínez de Perón's "annihilation decrees"[1] against left-wing guerrillas during Operativo Independencia (Operation Independence) in 1975[1] have also been suggested as dates for the beginning of the Dirty War.[citation needed]