Communism is a theory, and when you focus on the errors of those who falsely practiced that theory, you prevent yourself from learning. Read some easy fundamental Works like "The Communist Manifesto" and "Value, Price and Profit" by Marx, but also some good Texts that show the humanistic and libertarian core of communism, like Oscar Wilde's "The Soul of Man under Socialism". Read some good introductions, like Bini Admczak's "Communism for Kids", Michael Heinrich's or David Harvey's introductions to "The Capital" or Etienne Balibar's "The Philosophy of Marx". Be careful with the sources you seek; propaganda and biased journalism exists to create fear and hate at times.

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Consider the Marxist theory. This theory states that all governments in human history have been a class dictatorship, meaning that the state is under the command of the interests of one social class. This is why communists refer to capitalism as the "dictatorship of the bourgeoisie (capitalists)" and refer to socialism as the "dictatorship of the proletariat (workers). Modern communists refer - in according with the intention of Marx - to capitalism as the dictatorship of capital, i.e. of a blind and automatical-moving power, that was created by men but is now out of control. States are than not simply under the command of the interests of capitalists, but have to respect the rules of capitalism in order to fulfill their tasks. On the other side, "dictatorship of the workers" means the end of "dictatorship" itself and the end of classes. Marx described communism as "free association" of free individuals, in which the free developing of each one ist the condition for the free developing of all. Also against a work-fixation of traditional communists, Marx saw in communism the wind of work as a heavy and alienating task, the end of the "kingdom of necessity" and the begin of the "kingdom of freedom".