 The pages that were released were heavily blacked out with magic marker, or "redacted".In 1983, Wiener sued the FBI under the Freedom of Information Act with assistance from the ACLU of Southern California, including attorneys Dan Marmalefsky of Morrison & Foerster and Mark Rosenbaum of the ACLU.In response, the FBI turned over some documents, but withheld others claiming they contained "national security information provided by a foreign government under an explicit promise of confidentiality" and added that releasing the documents could lead to "military retaliation against the United States."