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.
De-Stalinization
De-Stalinization (Russian: десталинизация, "destalinizatsiya") consisted of a series of political reforms in the Soviet Union after the death of long-time leader Joseph Stalin in 1953, and the ascension of Nikita Khrushchev to power.