A file of signals intelligence reports, messages, and correspondence issued by the Government Code and Cypher School and sent by the head ('C') of the Secret Intelligence Service (MI6) to the Prime Minister, Winston Churchill. This file includes the following correspondence: a minute from C to the Prime Minister (PM) countering the PM's suggestion that certain Japanese diplomatic reports should be sent to Stalin; and from the German Legation in Kabul, a report of February 16 from the German Ministry of Foreign Affairs in Berlin to Kabul containing details of a planned operation involving the dropping of German agents of Russian extraction into Soviet Central Asia.