Christopher Lee for WaPo writes:
The National Archives helped keep secret a multi-year effort by the Air Force, the CIA and other federal agencies to withdraw thousands of historical documents from public access on Archives shelves, even though the records had been declassified.
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Archives officials agreed to help pull the materials for possible reclassification and conceal the identities of anyone participating in the effort.
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Thomas S. Blanton, executive director of the National Security Archive, said the memo "shows that the National Archives basically aided and abetted a covert operation that whited out the nation's history by reclassifying previously released documents."
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memory holes
In the walls of the cubicle there were three orifices. To the right of the speakwrite, a small pneumatic tube for written messages, to the left, a larger one for newspapers; and in the side wall, within easy reach of Winston's arm, a large oblong slit protected by a wire grating. This last was for the disposal of waste paper. Similar slits existed in thousands or tens of thousands throughout the building, not only in every room but at short intervals in every corridor. For some reason they were nicknamed memory holes. When one knew that any document was due for destruction, or even when one saw a scrap of waste paper lying about, it was an automatic action to lift the flap of the nearest memory hole and drop it in, whereupon it would be whirled away on a current of warm air to the enormous furnaces which were hidden somewhere in the recesses of the building.
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