civilian-grade research tasks. Mir was the only orbital station in operation from 1986 to 1998. Gradually, other modules were added to it, including American ones. However, the station deteriorated rapidly after a fire on board, so in 2001 it was decided to bring it into the atmosphere where it burned down. Human rights Human rights in the Soviet Union were severely limited. The Soviet Union was a totalitarian state from 1927 until 1953 and a one-party state until 1990. Freedom of speech was suppressed and dissent was punished. Independent political activities were not tolerated, whether these involved participation in free labor unions, private corporations, independent churches or opposition political parties. The freedom of movement within and especially outside the country was limited. The state restricted rights of citizens to private property. The Soviet conception of human rights was very different from international law. According to Soviet legal theory, "it is the government who is the beneficiary of human rights which are to be asserted against the individual". The Soviet state was considered as the source of human rights. Therefore, the Soviet legal system regarded law as an arm of politics and courts as agencies of the government. Extensive extra-judicial powers were given to the Soviet secret police agencies. The Soviet government in practice significantly curbed the rule of law, civil liberties, protection of law and guarantees of property, which were considered as examples of "bourgeois morality" by Soviet law theorists such as Andrey Vyshinsky. According to Vladimir Lenin, the purpose of socialist courts was "not to eliminate terror ... but to substantiate it and legitimize it in principle". The Soviet Union signed legally-binding human rights documents, such as the International Covenant on Civil and Political Rights in 1973, but they were neither widely known or accessible to people living under Communist rule, nor were they taken seriously by the Communist authorities. Economy The Soviet Union adopted a command economy, whereby production and distribution of goods were centralized and directed by the government. The first Bolshevik experience with a command economy was the policy of War communism, which involved the nationalization of industry, centralized distribution of output, coercive requisition of agricultural production, and attempts to eliminate money circulation, private enterprises and free trade. After the severe economic collapse, Lenin replaced war communism by the New Economic Policy (NEP) in 1921, legalizing free trade and private ownership of small businesses. The economy