From 1973 to 1977, Contreras led the agency on an international hunt to track down and kill the political opponents of the Junta, particularly members of the Communist and Socialist parties and the former guerrilla group and political party Movement of the Revolutionary Left (MIR). On 25 November 1975, General Augusto Pinochet's 60th birthday, leaders of the military intelligence services of Argentina, Bolivia, Chile, Paraguay, and Uruguay met with Contreras, in Santiago de Chile, officially creating the Plan Condor. According to the report "CIA activities in Chile" released on September 19, 2000, the US government policy community approved CIA's contact with Contreras from 1974 to 1977 to accomplish the CIA's mission in Chile in spite of his role in human rights abuses. By 1975 American intelligence reporting had concluded that Contreras was the principal obstacle to a reasonable human rights policy within the Pinochet government, but the CIA was directed to continue its relationship with Contreras, even giving Contreras a one-time payment in 1975. The CIA became concerned with Contreras' role in the assassination of former Salvador Allende cabinet member and ambassador to Washington Orlando Letelier and his American assistant, Ronni Karpen Moffit in Washington, D.C., on 21 September 1976. The CIA was said to have gathered specific, detailed intelligence reporting alleging Contrera's involvement in ordering the Letelier assassination, but the purported material remains classified and has been withheld at the request of the US Department of Justice (CIA, 2000) CIA contacts with Contreras continued until 1977.