 Adriana and Gaspar Tasca, both identified as Montoneros, were taken into custody between 7 and 10 December 1977 and remain unaccounted for.On 6 October 1978, José Pérez Rojo and Patricia Roisinblit, both Montoneros members, were made to disappear.According to different sources, 8,000 to 30,000 people are estimated to have disappeared and died during the military dictatorship that ruled Argentina from 1976 to 1983.