The Wikipedia article is the one to assign.
https://en.wikipedia.org/wiki/Operation_Condor

Subversion
https://en.m.wikipedia.org/wiki/Subversion

Countries involved:

Argentina
Bolivia
Brazil
Chile
Uruguay
Paraguay

Operation Condor: Deciphering the U.S. Role
J. Patrice McSherry, author of Predatory States: Operation Condor and Covert War in Latin America
https://www.globalpolicy.org/component/content/article/168/28173.html

Video: Operation Condor: A Latin American alliance that led to disappearances and death
http://youtu.be/-_YEKdzjSDA

Operation Condor: Landmark human rights trial reaches finale
http://www.bbc.com/news/world-latin-america-36394820

Operation Condor
https://en.m.wikipedia.org/wiki/Operation_Condor#U.S._involvement

John Dinges book

Operation Condor National Security Archive Presents Declassified Documentation in Argentina trial
http://nsarchive.gwu.edu/NSAEBB/NSAEBB514

Operation Condor Trial Tackles Coordinated Campaign By Latin American Dictatorships To Kill Leftists
http://youtu.be/A1XxJ3O3q4U