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.
Berta Daniel
One member of the intelligence community who had not fallen foul of the Stalin purges was Elena Stasova, with whom Daniel had worked at the IRH in the 1920s. Joseph Stalin died in March 1953, and in October 1953 Daniel wrote a letter to Stasova which the latter received, even though it was simply addressed to "Elena Stasova, Moscow city". It appears that it was as a result of their ensuing communication that on 28 January 1957 was posthumously rehabilitated by the appropriate Moscow military tribunal. A couple of months later, on 26 March 1957, Berta Daniel, still very much alive, was rehabilitated by the same Moscow tribunal.