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.
Yakov Dzhugashvili
Until recently, it was not clear when and how Dzhugashvili died. According to the official German account, he died by running into an electric fence in the Sachsenhausen concentration camp, where he was being held. Some have contended that Dzhugashvili committed suicide at the camp, while others have suggested that he was murdered.
Currently, declassified files show that Dzhugashvili was shot by a guard for refusing to obey orders. While Dzhugashvili was walking around the camp he was ordered back to the barracks under the threat of being shot. Dzhugashvili refused and shouted, "Shoot!" The guard shot him in the head. Stalin saw this as a more honourable death, and his attitude towards his son softened slightly.