According to American historian J. Patrice McSherry, based on formerly secret CIA documents from 1976, in the 1960s and early 1970s plans were developed among international security officials at the US Army School of the Americas and the Conference of American Armies to deal with perceived threats in South America from political dissidents. A declassified CIA document dated 23 June 1976, explains that "in early 1974, security officials from Argentina, Chile, Uruguay, Paraguay, and Bolivia met in Buenos Aires to prepare coordinated actions against subversive targets."