Zinoviev's letter was a controversial document sent in 1924 by Grigory Zinoviev, a leading Bolshevik, to the British Communist Party, urging them to incite revolution in Britain. This letter, which suggested that the British communists should collaborate with trade unions and leftist groups to instigate social upheaval, played a significant role in shaping public opinion and political discourse in Britain during the interwar period. Its publication created fear of communism in Britain and influenced the political landscape leading up to the general election of 1924.