The fourth flaw of Communism is that whenever the system encounters a serious difficulty or challenge, it gets replaced by dictatorship, with consequences far worse than before. The reason is that by destroying independent thinking, the system is bereft of new ideas that might help to overcome the challenge. As such, when the process of decline sets in or the system collapses altogether, there would be nothing, other than dictatorship, to fill the vacuum so created. Germany accepted Hitler, mainly because of the Communist movements that had swept the country. The experience of the French Revolution also supports that viewpoint. As the first wave of popular fervour over the newfound freedom receded, it gave rise to an autocrat like Napoleon. No one from among the ordinary people could assume the control of affairs under a democratic system.
Communism may choose to call itself a proletarian or a totalitarian regime. There is little doubt that this kind of system eventually and inevitably leads to dictatorship. In fact, the current situation is that although they claim to support representative government, in reality they do not share governance with ordinary citizens. There has only been dictatorship since the inception of Communism in Russia. Lenin was the first dictator, who was succeeded by Stalin; Molotov may well be the third dictator, and so on. In any case, such regimes cannot survive without the use of force, and the Russian experiment stands testimony to that.