Communism is a good ideology at it's base but it cannot work on a human civilisation. This is because people in power will use the system to their best interests as in the case of Stalin or Tito. Communism is easily exploited and even though it wants everyone to be equal and to be paid the same, it cannot work in a society as people want to succeed in life for one main reason. MONEY. If you do not gain any extra money or if there are no benefits in working hard, then why should we. The person who puts all their efforts will usually be rewarded but in this sort of society there will be no reward. This will lead to a lack of motivation in businesses and the economy will struggle to grow naturally.
Communism, in it's most basic form, is a classless, money-less, stateless society. Leninism, and other forms of Statist Communism, are totalitarian in the sense that, while realizing that the basis of political corruption is the monetary system, they do not realize the incentive that power provides to people. In fact, most politicians today only really become politicians for two reasons, the wealth is provides, or the power of dominating over people.
True Communism has only ever really been used in pre-monetary/pre-capitalist societies, primarily due to it's appeal to both freedom and voluntary altruism. However, this system has been used briefly in Spanish Catalonia during Spain's civil war. Described here by George Orwell.
"It was the first time I had ever been in a town where the working class was in the saddle. Practically every building of any size had been seized by the workers and was draped with red flags or with the red and black flag of the Anarchists; every wall was scrawled with the hammer and sickle and with the initials of the revolutionary parties; almost every church had been gutted and its images burnt. Churches here and there were being systematically demolished by gangs of workmen. Every shop and café had an inscription saying that it had been collectivised; even the bootblacks had been collectivised and their boxes painted red and black. Waiters and shop-walkers looked you in the face and treated you as an equal."
— George Orwell, 'Homage to Catalonia, ch. I'
However, Catalonia eventually fell to the combined might of the Fascists (composing of Hitler's, Mussolini's, and Fransisco Franco's forces), The Spanish Statist Communists (Backed with military aid by the U.S.S.R.), and the Spanish Republicans.
If Communism were ever truly applied without intervention from power hungry bureaucrats, then it would possibly be the most equal and free society ever developed.