First, Soviet people lost the freedom to own private property. Communism supposes the abolition of private property and the collectivization of every property, it means, the dominion of the communist state over private belongings. This meant the end of buying and selling things for the Soviet population and the centralization of the economy in the Communist state, which was in charge of the distribution of resources among the population.
Second, the citizens of the Soviet Union lost freedom of speech and freedom of the press. They were forbidden to publish and divulge their thoughts and ideas due to censorship and control of information exercised by the Soviet government. There was a strong ideological control over the population in order to avoid the dissemination of political ideas that could be against the government and the Communist system.