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.
Nikita Khrushchev
On 1 March 1953, Stalin suffered a massive stroke, apparently on rising after sleep. Stalin had left orders not to be disturbed, and it was twelve hours until his condition was discovered. Even as terrified doctors attempted treatment, Khrushchev and his colleagues engaged in intense discussion as to the new government. On 5 March, Stalin died. As Khrushchev and other high officials stood weeping by Stalin's bedside, Beria raced from the room, shouting for his car.