I read Fernando López's The Feathers of the Condor: Transnational State Terrorism, Exiles, and Civilian Anticommunism in South America (2016) for review in Journal of Cold War Studies. Here's how I start the review:
As previously classified or hidden documents slowly reach the light of day, we’re starting to understand more about Operation Condor, which was a coordinated effort by South American dictatorships to exterminate their political opponents during the mid-1970s. Fernando López has written an exhaustively researched book that aims to provide a fresh perspective on the existing literature (especially the work of J. Patrice McSherry, who wrote the preface).
The book has three intertwined arguments. First, it was much more difficult for these countries to join forces than typically realized. Second, the role of civilians needs more attention. Third, the militaries intentionally overstated the threat posed by the Junta de Coordinación Revolucionaria, a regional effort to unite guerrilla forces. Instead, the primary goal of the endeavor was to attack their political opposite and disrupt their connections to transnational human rights organizations.
It can be a bit of a dense book at times, but it successfully broadens the discussion beyond just the dictatorships that formed Operation Condor and the assumption that naturally they should get along. It was not just a military operation but rather was deeply connected to the radical civilian right as well.
It was published by Cambridge Scholars Publishing (which I had not heard of) and at least right now doesn't seem available on Amazon US. That's unfortunate, because I think a lot of people could find it interesting but it's not so easy to find.