Today, 4 January 2023, marks the centenary of Lenin’s dictation of his postscript to his ‘Letter to the Congress’, also known as his ‘Testament’. In it, Lenin took up the struggle against the bureaucratisation of the Soviet state, which was threatening to derail all the gains of the revolution. Suppressed for decades by Stalin, this Testament dispels the slander that Stalinism was the continuation of Leninism.