Question: How was the reclassification of documents in '06 revealed?
Sentence: In March 2006, it was revealed by the Archivist of the United States in a public hearing that a memorandum of understanding between NARA and various government agencies existed to "reclassify", i.e., withdraw from public access, certain documents in the name of national security, and to do so in a manner such that researchers would not be likely to discover the process (the U.S. reclassification program).
Answer in sentence: yes