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.
Solomon Lozovsky
In 1943, the actor Solomon Mikhoels and others began pushing for the creation of a Jewish homeland within the borders of the USSR. Lozovsky advised that the best location would be Crimea, and helped Mikhoels draft a written appeal to the Kremlin in February 1944. After the creation of the state of Israel, Stalin interpreted this talk as a Jewish conspiracy, and ordered the police to organise a show trial with Lozovsky as the main defendant. He was arrested on 26 January 1949, and tortured. Despite incredible pressure and despite being over 70 years old, Lozovsky never admitted his guilt or accused others. The closed trial lasted for two and one-half months, during which Lozovsky's testimony "shines out of this primordial darkness as the most remarkable and moving oration of dignity and courage in all of Stalin's trials." The skill with which he destroyed the prosecution caused the judge, Alexander Cheptsov, to interrupt the trial for a week, twice, to ensure and appeal for the investigation to be reopened - something that never happened in any other political trial during the Stalin years. Even after he had carried out his instruction to return a verdict of guilty, on 18 July 1952, he refused to order that the death sentences be carried out immediately, he forwarded an appeal for clemency to Stalin, which was rejected. Lozovsky was executed on August 12, 1952, together with thirteen other members of Jewish Anti-Fascist Committee, an event known as the Night of the Murdered Poets. He was the last and oldest Old Bolshevik to be murdered on Stalin's orders. The stenographic report of the trial was published only in 1994 and in a highly edited form.