There was no one. There was no historical example if a non-communist system switched to communist ever by elections. Fundamental of communism the one-party-only theory, so after the switch there are no real elections.
Boris Jeltsin.
1947
Leon Trotsky never acted as a leader. The Communist was originally elected to be a successor to Vladimir Lenin, but Joseph Stalin ended up taking the spot.
The communist leader of North Korea is Kim Il-Sung.
A communist leader
anti communist group leader
George Washington was elected leader of the Constitutional Convention.
dana the communist
Fidel Castro was a Cuban leader and communist ally of the Soviet Union.
Marshal Tito was the leader of the communist Yugoslavia until his death in 1980.
Elected, of course.
China's 'Communist Revolution' was the Chinese Civil War. The leader of the Communist group was Mao Zedong. The leader of the standing, nationalist government was Chiang Kai-Shek.