CIA document: Research Aid: Cryptonyms and Terms in Declassified CIA Files Nazi War Crimes and Japanese Imperial Government Records Disclosure Acts: Page 52: ..."Term: SMADD. Definition: Canada..."
A message regarding inquiries about the desired travel of a defector to visit his parents and checking with the SMADD embassy that was reported to the CIA. It further discussed if the related defector would face extradition attempts by the US government.
This cable with matching reference numbers to another related internal message about defector William Martin (104-10219-10110: MEMORANDUM: WILLIAM H. MARTIN), the subject of all related documents, contains matching slug lines KEYWAY and SMACT, contacts with LNGOLD (US State Department), and contacting the embassy of the related country in the same period of time. William Martin's parents lived in Vancouver, Canada.
CIA Counterintelligence Chief James Angleton corresponds with the Director of the NSA about defector William Martin and offers a source discussed Martin seeking to meet his parents in Canada but feared extradition to the United States. This supports that Canada is SMADD, the country whose embassy Agency officials desired to contact and where Martin sought to travel but feared legal action might be taken against him.