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What’s the context? Polish cryptologists reveal they have cracked the Enigma code, 26 July 1939

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The three Polish codebreakers Marian Rejewski, Jerzy Rozycki and Henryk Zygalski

The 3 Polish codebreakers Marian Rejewski, Jerzy Rozycki and Henryk Zygalski ‘Il y a du nouveau’ On 26 July 1939, in the Pyry Forest south of Warsaw, Polish cryptologists revealed...

What’s the Context? 20 December 1917: formation of the Cheka, the first Soviet security and intelligence agency

...the revolution and neutralise political opposition. The Cheka, established on 20 December 1917, was in many ways a reincarnation of the Tsarist security service, the Okhrana, making use of its...