Communism is the social system in which property and means of production belong to the community. That makes the “community” (whatever that means) the ultimate decision maker. However, the “community” in this context may be so broadly defined that it has no specific meaning and becomes an abstract concept. An abstract concept cannot manage property and production of goods and services, therefore, in order for the society to function, someone must be appointed as representatives of “community”, all people of the nation, and once it is done, they receive the absolute power because they act in the name of “the people”, “the community”, and there are no checks and balances of the democratic system to limit their power, because there is just one party – the Communist party, as all other parties contradict the very idea of communism. Therefore, those who disagree or attempt to critisize the communist leaders put themselves in the position of the enemies of the people.
However, that’s just one side of the equation. Another one is the people, who realize that they can personally benefit from the status quo by conforming with whatever the leaders say; this way they become the assistants of the regime and get their own share of power, expressed in the name of “the people”. “What, are you saying I’m wrong and have no right to do that? Do you know who I am? I am acting on behalf of our Leader in the name of the people! Are you saying you are against the people? Against the happiness of the people and justice for them?” – that’s how it worked in the USSR, for example, reinforced by the legal action against those who criticized anything Soviet (basically, anything in general, because everything was Soviet, including “the people”) and propaganda saying that the country was surrounded by the enemies and whoever criticized anything is assisting those enemies and therefore an enemy him/herself.