The U.S. government just released newly declassified documents related to Operation Condor, which come after President Obama's visit to Argentina earlier this year. The National Security Archive has a sampling. There is no sugar coating it--the documents show how much the U.S. knew about Latin American military governments finding targets for assassination, including NGOs.
As more documents find the light of day, the scope of how bloodthirsty the Condor architects were keeps expanding. The complicity of Henry Kissinger cozying up to the Argentine junta also becomes ever more disgusting.
If you're interested in more detail, check out my review of Fernando López's new book on Condor.