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Operación Masacre is a 1973 historical drama film co-written and directed by Jorge Cedrón and based on the nonfiction book of the same name by Rodolfo Walsh, who also wrote the script. It stars Norma Aleandro, Víctor Laplace, Ana María Picchio, Walter Vidarte and Julio Troxler. It was filmed clandestinely during the self-styled "Argentine Revolution" dictatorship (1966–1973), and finally released on September 27, 1973.