After the assassination of President John F. Kennedy in November 1963, the CIA appeared eager, even desperate, to embrace the version of events being offered by the FBI, the Secret Service and other parts of the government. The official story: that a delusional misfit and self-proclaimed Marxist named Lee Harvey Oswald killed the president in Dallas with his $21 mail-order rifle and there was no evidence of a conspiracy, foreign or domestic. Certainly, the CIA’s leaders told the Warren Commission, the independent panel that investigated the murder, there was no evidence of a conspiracy that the spy agency could have foiled.
But thousands of pages of long-secret, assassination-related documents released by the National Archives last week show that, within a few years of Kennedy’s murder, some in the CIA began to worry internally that the official story was wrong—an alarm the agency never sounded publicly.
Specifically, key CIA officials were concerned by the mid-1970s that the agency, the FBI, the Secret Service and the White House commission led by Chief Justice Earl Warren had never followed up on important clues about Oswald’s contact with foreign agents, including diplomats and spies for the Communist governments of Cuba and the Soviet Union, who might have been aware of his plans to kill Kennedy and even encouraged the plot. (There is no credible evidence cited in the documents released so far that Cuban leader Fidel Castro or other foreign leaders had any personal role in ordering Kennedy’s murder.)
http://www.politico.com/magazine/story/2017/08/03/jfk-assassination-lone-gunman-cia-new-files-215449