Secondly, after the Revolution Moscow became the Mecca of communism, and after the foundation of the Comintern, communists from all countries flocked to Moscow. The Comintern openly declared as its aim the destruction of capitalism, and in this manifesto it was helped from all sides, the Tcheka and the GRU in particular developing their espionage activities. On the orders of the Comintern [The Communist International, grouping together the communist parties of the world and declaring itself as 'the headquarters of the worldwide communist revolution'.], thousands of communists spread into foreign states worldwide under the control of the Soviet intelligence organisations. Some of these, like the German communists Richard Sorge and Karl Ramm, the Finnish communist Otto Kusinien, the Hungarian Sandor Rado, are now well known to history, but thousands more remained unknown, activists labouring strenuously to fulfil the will of Soviet intelligence. Thirdly, after the Revolution millions of emigres appeared from Russia, all over the world. Any Soviet intelligence officer who had undergone the most elementary linguistic training could move about freely from country to country without attracting the slightest suspicion.

External circumstances favoured communism too. After the First World War the world veered sharply towards communist doctrines. Communist parties were strong and united. In Germany and Hungary there were communist revolutions. The heat of the conflagration was felt in Spain, France and China. Soviet intelligence skilfully exploited the situation which was unfolding. The First World War also left behind a legacy of despair - the world had given way and there were many people who had lost their hopes and ideals. Embittered and depressed, their recruitment presented no difficulty whatsoever. In one of the early GRU instruction manuals there is the following advice: 'If you need a facilities agent (a radio operator, owner of a safe house or transmission point) find a tall handsome man who has lost a leg or an arm in the war.'