After the appointment of Adolf Hitler as chancellor in 1933, Stalin began to privately regret his decision to prevent a popular front of communist and social democratic forces emerge in Germany. Across Europe communist parties found themselves in uneasy alliances with social democrats and in Britain the threat of the British Union of Fascists galvanised this process. The popular front government in Spain that came under assault in 1936 drew communist and non communist volunteers from Britain and other European countries to defend it, with both Hitler and Stalin becoming involved in the fate of the Spanish people.

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