The actions by governments of communist states have been subject to criticism across the political spectrum. Communist party rule has been especially criticized by anti-communists and right-wing critics, but also by other socialists such as anarchists, trotskyists, democratic socialists, libertarian socialists and orthodox marxists. Ruling communist parties have also been challenged by domestic dissent. According to the critics, rule by communist parties has often led to totalitarianism, political repression, restrictions of human rights, poor economic performance, and cultural and artistic censorship.
Several authors noted gaps between official policies of equality and economic justice and the reality of the emergence of a new class in communist countries which thrived at the expense of the remaining population. In Central and Eastern Europe, the works of dissidents Václav Havel and Aleksandr Solzhenitsyn gained international prominence, as did the works of disillusioned ex-communists such as Milovan Đilas, who condemned the new class or nomenklatura system that had emerged under communist party rule. Major criticism also comes from the anti-Stalinist left and other socialists. Its socio-economic nature has been much debated, varyingly being labelled a form of bureaucratic collectivism, state capitalism, state socialism, or a totally unique mode of production.
Communist party rule has been criticized as authoritarian or totalitarian for suppressing and killing political dissidents and social classes (so-called "enemies of the people"), religious persecution, ethnic cleansing, forced collectivization, and use of forced labor in concentration camps. Communist party rule has also been accused of genocidal acts in Cambodia, China, Poland and Ukraine, although there is scholarly dispute regarding the Holodomor's classification as genocide.