The civic-military dictatorship of Argentina existed from 1976 to 1983 by the military juntas under Operation Condor. The Argentine SIDE cooperated with the Chilean DINA in numerous cases of "desaparecidos". They assassinated Chilean General Carlos Prats, former Uruguayan MPs Zelmar Michelini and Héctor Gutiérrez Ruiz, as well as the ex-president of Bolivia, Juan José Torres, in Buenos Aires. The SIDE also assisted Bolivian general Luis García Meza Tejada's "Cocaine Coup" in Bolivia, with the help of the Italian Gladio operative Stefano Delle Chiaie and Nazi war criminal Klaus Barbie (see also Operation Charly).Recently, since the opening of confidential archives, it has been discovered that there were operative units composed of Italians, used at ESMA for the repression of groups of Italian Montoneros. This unit called "Shadow Group" was led by Gaetano Saya at the time Officer of the Italian stay behind next - Operative Gladio. In April 1977, the "Madres de la Plaza de Mayo", a group of mothers whose children had disappeared, started demonstrating each Thursday in front of the "Casa Rosada" on the plaza. They were seeking to learn the location and fates of their children. The disappearance in December 1977 of two French nuns and several founders of the Mothers of the Plaza de Mayo gained international attention. Authorities later identified their remains among the bodies washed up on beaches in December 1977 south of Buenos Aires, victims of death flights. Other members of the Mothers of the Plaza de Mayo continued the struggle for justice in the ensuing decades.