Purim
There is a tale in the Hasidic Chabad movement that supposedly Joseph Stalin died as a result of some metaphysical intervention of the seventh Chabad leader, Rabbi Menachem Mendel Schneerson, during the recitation of a discourse at a public Purim Farbrengen. Stalin was suddenly paralyzed on 1 March 1953, which corresponds to Purim 1953, and died 4 days later. Due to Stalin's death, nationwide pogroms against Jews throughout the Soviet Union were averted, as Stalin's infamous doctors' plot was halted.
Joseph Stalin
Lenin died in January 1924. Stalin took charge of the funeral and was one of its pallbearers; against the wishes of Lenin's widow, the Politburo embalmed his corpse and placed it within a mausoleum in Moscow's Red Square. It was incorporated into a growing personality cult devoted to Lenin, with Petrograd being renamed "Leningrad" that year. To bolster his image as a devoted Leninist, Stalin gave nine lectures at Sverdlov University on the "Foundations of Leninism", later published in book form. At the following 13th Party Congress, "Lenin's Testament" was read to senior figures. Embarrassed by its contents, Stalin offered his resignation as General Secretary; this act of humility saved him and he was retained in the position.