creation of the U.S. House of Representatives Select Committee on Assassinations (HSCA).
In 1978, HSCA released its final report which found, among other things,
"2.Scientific acoustical evidence establishes a high probability that two gunmen fired at President John F. Kennedy."
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"3.The committee believes, on the basis of the evidence available to it, that President John F. Kennedy was probably assassinated as a result of a conspiracy.
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"4. ... The investigation into the possibility of conspiracy in the assassination was inadequate.
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"5. The Department of Justice failed to exercise initiative in supervising and directing the investigation by the Federal Bureau of Investigation of the assassination.
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"c. The Federal Bureau of Investigation failed to investigate adequately the possibility of a conspiracy to assassinate the President.
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"8 b.The Warren Commission failed to investigate adequately the possibility of a conspiracy to assassinate the President. ...
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http://www.archives.gov/research/jfk/select-committee-report/summary.html
The CIA has been in the business of overturning governments. We will never know the extent to which rogue agents from any agency of this country or foreign countries may have been involved in the JFK assignation. The Warren Commission sufficiently quashed a further investigation at the time. What we do know is that the physical evidence is inconsistent with the lone-gunman assertion, that our own governmental agencies did not look further, and that the MSM often denigrated those who asked at the time for a more through investigation as being conspiracy theorists. For more information about the CIA's connection with the MSM, Google Operation Mockingbird. They say that Operation Mockingbird has been discontinued.