 The USSR's formation was ratified in December 1922; although officially a federal system, all major decisions were taken by the governing Politburo of the Communist Party of the Soviet Union in Moscow.Their differences also became personal; Lenin was particularly angered when Stalin was rude to his wife Krupskaya during a telephone conversation.In the final years of his life, Krupskaya provided governing figures with Lenin's Testament, a series of increasingly disparaging notes about Stalin.