The bipartisan Senate Select Committee documented at least eight distinct CIA plots against Castro between 1960 and 1965. The report Alleged Assassination Plots Involving Foreign Leaders is a primary source available in full.

The CIA's own Inspector General produced a classified internal report in 1967 confirming the assassination programme, including the Mafia partnership. The report was declassified and is publicly available.

Robert Maheu, Johnny Roselli, Sam Giancana, and Santos Trafficante Jr. are identified in congressional testimony and FBI files as participants in the CIA's organised-crime partnership for Castro assassination. Roselli testified before the Church Committee.

Lorenz testified in congressional proceedings to her CIA recruitment and the failed poisoned-pill attempt. She stated she concealed the pills in cold cream, which dissolved them. Her account is corroborated by contemporaneous CIA records.

Fidel Castro survived every assassination attempt and died in Havana on 25 November 2016 at the age of 90. The operational failure is total and is itself the most significant documented outcome.

The Church Committee found the authorisation chain for specific plots ambiguous — it was unclear in some cases whether the President had explicitly sanctioned individual operations or whether the CIA acted under broadly understood policy. This ambiguity is itself documented.

Operation Mongoose was officially authorised by President Kennedy following the Bay of Pigs failure. The programme was run by Brigadier General Edward Lansdale under Robert Kennedy's supervision. Its existence is a matter of public record.

CIA technical staff produced operational proposals for an exploding seashell to be placed near Castro's dive sites, and for a skin-contact-pathogen diving suit. Both were assessed and not executed. The proposals are documented in CIA files.

The 1975 Church Committee report — the most comprehensive public accounting of CIA assassination plots — distinguished between authorized planning, unauthorized freelancing by case officers, and operational execution. Many of the Cuba plots (poison cigars, exploding seashell, Mafia intermediary schemes) never advanced beyond early planning or were abandoned before implementation. The Committee found that direct presidential authorization for assassinations could not be established in several cases. This distinction matters: documenting that the CIA planned many operations is different from establishing that a coherent, sustained, high-level program functioned continuously from 1960 through the 1970s.

The Cuban exile community in Miami produced substantial testimony about CIA-backed anti-Castro operations, some of which has been verified and some of which reflects community mythology and motivated attribution. Operations carried out independently by exile groups — including some Alpha 66 attacks — were sometimes retrospectively attributed to CIA direction when evidence of authorization was absent or ambiguous. Cuban government accounts of assassination attempts, numbering over 600 in official tallies, similarly conflate genuine CIA operations with exile freelancing, accidents, and exaggerated claims. Triangulating between these sources requires source-critical discipline.

The bipartisan Senate Select Committee documented at least eight distinct CIA plots against Castro between 1960 and 1965. The report Alleged Assassination Plots Involving Foreign Leaders is a primary source available in full.

The CIA's own Inspector General produced a classified internal report in 1967 confirming the assassination programme, including the Mafia partnership. The report was declassified and is publicly available.

Robert Maheu, Johnny Roselli, Sam Giancana, and Santos Trafficante Jr. are identified in congressional testimony and FBI files as participants in the CIA's organised-crime partnership for Castro assassination. Roselli testified before the Church Committee.

Lorenz testified in congressional proceedings to her CIA recruitment and the failed poisoned-pill attempt. She stated she concealed the pills in cold cream, which dissolved them. Her account is corroborated by contemporaneous CIA records.

The Church Committee found the authorisation chain for specific plots ambiguous — it was unclear in some cases whether the President had explicitly sanctioned individual operations or whether the CIA acted under broadly understood policy. This ambiguity is itself documented.

Operation Mongoose was officially authorised by President Kennedy following the Bay of Pigs failure. The programme was run by Brigadier General Edward Lansdale under Robert Kennedy's supervision. Its existence is a matter of public record.

CIA technical staff produced operational proposals for an exploding seashell to be placed near Castro's dive sites, and for a skin-contact-pathogen diving suit. Both were assessed and not executed. The proposals are documented in CIA files.

Fidel Castro survived every assassination attempt and died in Havana on 25 November 2016 at the age of 90. The operational failure is total and is itself the most significant documented outcome.

The 1975 Church Committee report — the most comprehensive public accounting of CIA assassination plots — distinguished between authorized planning, unauthorized freelancing by case officers, and operational execution. Many of the Cuba plots (poison cigars, exploding seashell, Mafia intermediary schemes) never advanced beyond early planning or were abandoned before implementation. The Committee found that direct presidential authorization for assassinations could not be established in several cases. This distinction matters: documenting that the CIA planned many operations is different from establishing that a coherent, sustained, high-level program functioned continuously from 1960 through the 1970s.

The Cuban exile community in Miami produced substantial testimony about CIA-backed anti-Castro operations, some of which has been verified and some of which reflects community mythology and motivated attribution. Operations carried out independently by exile groups — including some Alpha 66 attacks — were sometimes retrospectively attributed to CIA direction when evidence of authorization was absent or ambiguous. Cuban government accounts of assassination attempts, numbering over 600 in official tallies, similarly conflate genuine CIA operations with exile freelancing, accidents, and exaggerated claims. Triangulating between these sources requires source-critical discipline.

The Church Committee's 1975 staff report on assassination plots documented that many CIA operations against Castro never progressed beyond planning or early preparation stages. Poison capsule operations were not delivered; rifle-scope schemes were abandoned. The Committee itself carefully distinguished between conspiracy to assassinate (which it found evidence of) and actual assassination attempts (which mostly failed at early stages). The proliferation of documented 'plots' partly reflects bureaucratic planning culture within CIA rather than near-successful covert operations.

The historical record contains multiple instances where Cuban exile groups claimed CIA backing for operations that were either unauthorized freelance actions, Cuban exile fabrications for fundraising purposes, or operations that the CIA had explicitly declined to support. The post-Bay-of-Pigs environment of autonomous exile militant groups — particularly ALPHA 66 and other Directorio factions — meant that many claimed 'CIA operations' against Castro were in fact unauthorized actions the CIA sought to restrain during certain policy periods.