Grainy images of 70,000 protesters in Leipzig carrying candles and chanting "Wir sind das Volk" -- "We are the people!" -- were beamed across the world on October 9, 1989. The rally was a turning point in the fall of the Iron Curtain a month later. Kühne was one of the demonstrators who, in his words, "longed for a free and united country." Then a 21-year-old locksmith working at the state railway company, he said the uprising in his hometown was "the greatest thing I've ever experienced." Today he is again drawing inspiration from Germany's peaceful revolution -- this time,...