Joseph Stalin - Soviet Union
Mao Zedong - China
Fidel and Raul Castro - Cuba
Boleslaw Bierut - Poland
However what Marx and Engels wrote in the Communist Manifesto did not match what communism actually turned into. Many Leaders such as Stalin etc turned it into something different as to what was intended and therefore many such as Stalin, Mao and the Castros wouldn't be considered by Marx or Engels to be communist in the way that they were e.g. Mao had his own branch of communism - Maoism as did Stalin - Stalinism etc. The leader who was most in line with the original theory of communism was Lenin and therefore is probably the best example of a communist leader.
No. Communism is a belief system. Some countries have a Communistic-style government, and each country has its own leader.
YES
Communism is an example of a political/socioeconomic idealogy, like Capitalism, Socialism, or Totalitarianism.
What leader? According to Marx communism is supposed to be ruled by the Proletariat (the class of the poorest of the working poor), not one man!
Theocracy
He was the communist leader of Russia!
The first communist leader of the Soviet Unionwas Vladimir Lenin.
The Russian leader Stalin would have been seen as the father of communism.
A man's communism was taken away from him for no reason.
Mikhael Gorbachev
Anti-communism simply means against communism. An example of an economic society that is anti-communist is capitalism.
Communism is a fully democratic classless society with no leaders.