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Archive (TNA)
Prime Ministerial Private Office files

Security: Armstrong minute to Butler (“Professor Hugh Hambleton”) [Canadian Soviet spy - if asked at PMQs MT must say case sub judice for fear of prejudicing trial] [declassified 2012]

Document type: Declassified documents
Source: PREM19/906 f5
Editorial comments: The full file from which this item is taken can be seen here. Read other documents selected from this file.
Importance ranking: Major
Word count: 1p
Themes: Parliament, Defence (general), Foreign policy (Americas excluding USA), Foreign policy (USSR & successor states), Security services & intelligence, British relations with the Soviet Union