Newly uncovered secret documents from the “Berrutti Archive” detail previously unknown collaboration between the military intelligence agencies of Chile and Uruguay in 1973. The files, published by CIPER Chile, reveal official correspondence outlining cooperation during a critical period following the Chilean coup d'état. These “oficios secretos” (secret official letters) demonstrate a coordinated effort between the two nations’ intelligence services. The nature of this collaboration suggests a broader network of cooperation among South American military regimes, potentially linked to Operation Condor. Details of the collaboration remain unclear, but the documents signify a deepening of ties between the Chilean and Uruguayan dictatorships. Further investigation is underway to fully understand the extent and implications of this intelligence sharing. The archive promises to shed light on a dark chapter in South American history.