President Donald Trump has blocked the release of hundreds of records on the assassination of President John F. Kennedy, bending to CIA and FBI appeals, while the National Archives came out Thursday night with a hefty cache of others.
Trump allowed the release of 2,800 other records.
While few expect any of the myriad conspiracy theories about Kennedy's death to be investigated, Morely said the new trove of documents could lead to a "significant new understanding of what caused the death of John F. Kennedy".
Fascinating documents due to be released by the US government are expected to shed light on Harvey Lee Oswald's trip to the Soviet Union.
"KGB headquarters indicated that in view of this information, it was necessary for the Soviet Government to know the existing personal relationship between President Johnson and the Kennedy family, particularly that between President Johnson and Robert and 'Ted' Kennedy". Intelligence and law enforcement officials argued their release could thus put at risk some more recent "law enforcement equities" and other materials that still have relevance, the official said.
Katzenbach is known from previously released documents to have shared Hoover's concern, writing in a memo the next day, on Nov. 25, 1963, that "the public must be satisfied that Oswald was the assassin; that he did not have confederates who are still at large; and that evidence was such that he would have been convicted at trial".
President Trump had confirmed on Saturday that he would allow for the opening of the documents, "subject to the receipt of further information". An administration official told reporters on Thursday that the files that remain secret have information that "remains sensitive depending on its context".
The Kennedys sat in an open top limousine with Texas governor John Connally and his wife Nelly for the 10-mile procession through Dallas.
One document revealed that the CIA intercepted a call Kennedy assassin Lee Harvey Oswald made to a KGB officer at the Russian Embassy in Mexico less than two months before killing Kennedy and that CIA agents speculated that he might be a KGB agent.
They include cables, notes and reports stamped "Secret" that reveal the suspicions of the era - around Cubans and Communists.
It's unclear whether the call was merely a prank and the timing coincidental.
J. Edgar Hoover, then the director of the FBI, in 1971.
The British Security Service MI5 said the call was made to the senior reporter of the newspaper, the BBC reported.
Sixty-one percent of Americans already do not believe the government's conclusion that Oswald acted alone.
The US and Soviet Union, the world's foremost superpowers at the time, were in the midst of the Cold War with bitter relations.
Editor's note: Take a look back at The Dallas Morning News archives. White House officials said Trump would let 2,800 records come out Thursday evening, but was placing the remaining files under a six-month review. Seemingly disenchanted with Soviet life, he returned to U.S. soil less than two years later after apparently trying to commit suicide.