October 25, 1952: CIA Chief Approves Covert Intervention in Estonia, Codenamed "Operation AEBASIN"
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Target State: United Soviet Socialist Republic – Estonian SSR Dates: Approximately 1949-1956 (Less aggressive operations continued) Tactics: Covert – Dissidents, psychological warfare Type of Operation: Offensive Regime Replaced: No Primary Source Documents: • National Security Council (October 5, 1949) “NSC-58 on Policy Toward Eastern Europe,” link. • Central Intelligence Agency (October 16, 1952) “Project Outline: AEBasin,” link. • Central Intelligence Agency (October 25, 1954) “Notification of Approval, Project AEBasin (SR-2/Estonia),” CIA-FOIA Doc. 5197c264993294098d50e174. • Central Intelligence Agency (March 17, 1953), “Memorandum for the Chief of Foreign Intelligence,” CIA-FOIA Doc. 5197c269993294098d50ed99. • Central Intelligence Agency (August 23, 1954) “Cover Division Comments on AEBASIN,” link.

Source: Lindsey O'Rourke, Covert Regime Change,