Rich,
re:"Communism as a philosophy is a leftist policy, but in practice has evolved in hard right actions in the cases you discussed." Communism recognizes that it is necessary to become a despotic state to remove the bourgeoisie (even after coming to power thru civil war). Mao, Lenin, and Pol Pot were merely extending the "revolution" and implementing Communist philosophy.
"Political power, properly so called, is merely the organized power of one class for oppressing another. If the proletariat during its contest with the bourgeoisie is compelled, by the force of circumstances, to organize itself as a class; if, by means of a revolution, it makes itself the ruling class, and, as such, sweeps away by force the old conditions of production, then it will" The Communist Manifesto, Engel and Marx |