Koestler was at that time working on behalf of the Comintern and as an agent of the Loyalist Government's official news agency, using for cover accreditation to the British daily News Chronicle.
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Koestler's incarceration in the Spanish Civil War, by the Phalange - documented in Spanish Testament (1937), and revised 1942 as Dialogue with Death, and which formed part of the basis for his novel Darkness at Noon (1940).