Was the May 7 , 1928 plane crash on Stone Mountain caused by alcohol ?
Anandyn Amar , who had served twice as Prime Minister of Mongolia ( 1928–30 and 1936–39 ) and Chairman of the Presidium of State ( 1932–36 ) before becoming a victim of a purge by Joseph Stalin , was posthumously rehabilitated , more than 20 years after his execution by the Soviet Union on July 27 , 1941 .