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This mode of operation recalls the June 20, 1973 Ezeiza massacre in Buenos Aires, when the Argentine Anticommunist Alliance (aka Triple A), founded by José López Rega (a P2 member), opened up fire on the left-wing Peronists.
Upon the General's return to Argentina, this split became violent, as symbolized above all by the massacre at Ezeiza the day of his arrival back in the country.