Eventually almost all of the Bolsheviks who had played prominent roles during the Russian Revolution of 1917, or in Lenin's Soviet government, were executed. Out of six members of the original Politburo during the 1917 October Revolution who lived until the Great Purge, Stalin himself was the only one who remained in the Soviet Union, alive. Four of the other five were executed; the fifth, Leon Trotsky, had been forced into exile outside the Soviet Union in 1929, but was assassinated in Mexico by Soviet agent Ramón Mercader in 1940. Of the seven members elected to the Politburo between the October Revolution and Lenin's death in 1924, four were executed, one (Tomsky) committed suicide, and two (Molotov and Kalinin) lived.