If you understand the Operation Gladio program that NATO ran in Western Europe from the 1950s through the late 1970s, then you have a headstart in understanding Operation Condor in South America which happened during a 15-year period beginning in 1968.
America’s interests in South America created the justification in the eyes of Washington DC to exert its massive financial and military influence over the region in order to stop the potential spread of Communism, which never actually materialized. What did materialize was authoritarian anti-Communist dictators that America installed and controlled through its many tentacles, but this subversion program took on a new look when the Church was added to the decision-making process.