Gorbachev's Glasnost refers to the policy of openness and transparency in government and society that was implemented by Mikhail Gorbachev, the General Secretary of the Communist Party of the Soviet Union, in the mid-1980s. This policy aimed to encourage free expression, reduce censorship, and allow for public discussion of political issues, which ultimately played a significant role in fostering political change and unrest within Eastern Europe, culminating in events like the fall of the Berlin Wall.