Mikhail Gorbachev is living proof that the word is mightier than the sword and that ideas, not armies, change the world. Dedicated to ridding humanity of the threat of nuclear annihilation, Gorbachev called for multilateral action to forge a common future at a time when the superpowers were at loggerheads. Two key words, perestroika and glasnost, characterized his philosophy--words that came to represent change and freedom in the universal...