"The Sordid History of Cuba's Spy Apparatus"
Appendix to Brothers in Arms: The Kennedys, the Castros, and the Politics of Murder
by Gus Russo and Stephen Molton

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To those who labor under the misconception that Fidel Castro’s regime was incapable of maintaining a secret pipeline to a Lee Oswald, or not inclined to authorize and/or condone assassinations, an overview of Castro’s spy agencies might prove instructive. Traditionally, it has been infinitely easier to obtain operational details and internal structural layouts for the offices of America’s secret warriors than for those of its intelligence adversaries. This is especially true for Cuba’s spy apparatus. Given the relative transparency of the US government, thousands of books and monographs have been written on CIA, FBI, NSA, Military Intelligence, etc. But for those seeking to determine if Cuba’s spooks were prone to instigate (or even condone, as in the Kennedy case) foreign assassinations, it has been near impossible to get answers. However, when one pieces together testimony, CIA debriefs, and interviews from Cuba’s spy defectors, some very close to the top of its bureaucracy, a consistent and far different picture emerges of Cuba’s intel modus operandi than most would assume.
    The New York Times called Cuba's intelligence apparatus the “Little Spy Engine That Could.”  Indeed, far from being the undersized counterintelligence force that is commonly perceived for the diminutive nation, Cuba’s secret services are surprisingly aggressive and proactive. In fact, despite its weak economy and small size, the island nation boasts an intelligence arm that, relatively speaking, is much larger than that of the United States, with wide-ranging clandestine operations ongoing throughout the globe. The only small nation that even comes close to Cuba’s spycraft intensity is Israel.

http://cuban-exile.com/doc_451-475/doc0451.html