History of socialism under challenge from Solidarność, or Solidarity, a labor union under the leadership of Lech Wałęsa. The union was sufficiently threatening to the government that on 13 December 1981, the head of state, Wojciech Jaruzelski declared martial law, suspended the union, and imprisoned most of its leaders. Mikhail Gorbachev (born 1931), who took control in 1985, was the first Soviet leader to have been born after the October revolution. He is remembered for three initiatives: "glasnost", "perestroika", and the "Frank Sinatra doctrine". "Glasnost", or "openness", was Gorbachev's term for allowing public debate in the Soviet Union to an unprecedented degree. "Perestroika"
Mikhail Gorbachev in the Soviet Union weakened, and centralized power from Moscow was unable to combat centrifugal forces in the South. In the elections, many Party candidates were defeated. Furthermore, Boris Yeltsin was elected as mayor of Moscow and returned to political prominence to become an increasingly vocal critic of Gorbachev. Gorbachev chose a vice president; but when first Shevardnadze, then Kazakh leader Nursultan Nazarbayev, turned it down, Gorbachev chose Gennady Yanayev, the head of the All-Union Central Council of Trade Unions and a known hardliner. This decision would come back to haunt Gorbachev later. In contrast to the controversy at home