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.
Conspiracy theories about Adolf Hitler's death
The theory that Hitler did not commit suicide, but instead escaped with his wife, was promoted by the Soviet government as part of its state-sponsored disinformation campaign. The myth was first presented to the public by Marshall Georgy Zhukov at a press conference on 9 June 1945, on orders from Soviet leader Joseph Stalin. When asked at the Potsdam Conference in July 1945 how Hitler had died, Stalin said he was living "in Spain or Argentina." This has been a springboard for various conspiracy theories, despite the official conclusion by Western powers, and the consensus of historians, that Hitler killed himself on 30 April 1945.