This explains a lot. It describes the FBI's apparent practice of "blacklisting" requested records and not providing them.
Hat tip to Jim for sending this to us.
“Og-blog” stands for “open-government blog” and that’s what we do: tell people about open-government issues of interest to regular citizens, media, trade associations, and government agencies. We find interesting stories and court cases from Washington State and other places about the Public Records Act, Open Public Meetings Act, access-to-court rulings, and media law.