The Leningrad affair, or Leningrad case (Russian: Ленинградское дело, Leningradskoye delo), was a series of criminal cases fabricated in the late 1940s–early 1950s by Joseph Stalin in order to accuse a number of prominent Leningrad based authority figures and members of the All-Union Communist Party (Bolsheviks) of treason and intention to create an anti-Soviet, Russian nationalist, organization based in the city.[1][2][3] This happened in the aftermath of the Siege of Leningrad during the war, the victorious end of which led to the mayor, his deputies and others who kept Nazi German forces out of the city earning fame and strong support as heroes all over the USSR.
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