In 1989, popular civil and political public discontent toppled the Communist governments of the Warsaw Treaty countries. The beginning of the end of the Warsaw Pact, regardless of military power, was the Pan-European Picnic in August 1989. The event, which goes back to an idea by Otto von Habsburg, caused the mass exodus of GDR citizens and the media-informed population of Eastern Europe felt the loss of power of their rulers and the Iron Curtain broke down completely. Though Poland's new Solidarity government under Lech Wałęsa initially assured the Soviets that it would remain in the Pact, this broke the brackets of Eastern Europe, which could no longer be held together militarily by the Warsaw Pact. Independent national politics made feasible with the "perestroika" and "glasnost" policies induced institutional collapse of the Communist government in the USSR in 1991. From 1989 to 1991, Communist governments were overthrown in Albania, Poland, Hungary, Czechoslovakia, East Germany, Romania, Bulgaria, Yugoslavia, and the Soviet Union.