Mikhail Gorbachev was General Secretary of Communist Party of Soviet Union from 1985 until 1991. He is known for his efforts to democratize country's political system and decentralize its economy, a policy known as perestroika.
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Perestroika: A political movement within Communist Party of Soviet Union during 1980s, widely associated with Mikhail Gorbachev; it includes restructuring of economic system.
Glasnost: A policy that called for increased openness and transparency in government institutions and activities in Soviet Union.
Communist Party of Soviet Union: The founding and ruling political party of Soviet Union which operated under an ideology based on Marxism-Leninism.