On 5 March 2013, twenty-five former high-ranking military officers from Argentina and Uruguay went on trial in Buenos Aires, charged with conspiracy to "kidnap, disappear, torture and kill" 171 political opponents during the 1970s and 1980s. Among the defendants are former Argentine "presidents" Jorge Videla and Reynaldo Bignone, from the period of "El Proceso." Prosecutors are basing their case in part on U.S. documents declassified in the 1990s and later, and obtained by the non-governmental organization, the National Security Archive, based at George Washington University in Washington, DC.