Operación Masacre

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 from 1970 to 1972, during the self-styled "Argentine Revolution" dictatorship (1966–1973), and released when democracy was reinstalled in the country, especifically on September 27, 1973.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.