CIAs Raymond Rocca, writing to Richard Helms regarding counterintelligence chief James Angletons desire to stonewall the Warren Commission on certain CIA materials passed to the Secret Service.
What was so sensitive that Angleton, one of the most powerful figures in the CIA, preferred waiting out the Commission to cooperating with investigators.
One of the matters at hand was photographs of a mystery man taken in Mexico City and rushed to Dallas on the evening of November 22, 1963, and subsequently provided to the Secret Service via the White House.
On February 12, 1964, the Warren Commission wrote to CIA Director McCone, asking for all materials that the CIA had passed to the Secret Service since JFKs assassination. Roccas internal letter to Deputy Director for Plans Richard Helms of March 5, 1964, transmitted his boss Angletons desire to demur on this request.
The materials were photographs of the so-called Mexico City mystery man and cables regarding the photos. In a meeting on March 9, 1964, Helms told Commission staffer Howard Willens that the CIA had certain unspecified problems in complying with the request. Willens refused to accept this response.
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