On April 5, 1911, 400,000 people lined the rain-drenched sidewalks of New York as an empty, horse-drawn hearse crept from the dank, narrow streets of the Lower East Side toward the skyscrapers towering over Madison Square. New Yorkers from all walks of life had come to pay tribute to the unidentified victims of the Triangle fire: the deadliest workplace accident in the city's history. A few weeks earlier, the workers had been forgotten cogs in America's immense industrial machine; now, one in 10 New Yorkers were there to claim them as their own.