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The 1911 May Day parade in New York City parade paid special tribute to the victims of the recent Triangle Waist Co. fire about two months earlier. A sign in Yiddish notes "146" — the number of fire victims at the garment factory. The workplace disaster galvanized the American labor movement. (Library of Congress/Bain News Service collection)

The 1911 May Day parade in New York City parade paid special tribute to the victims of the recent Triangle Waist Co. fire about two months earlier. (Library of Congress/Bain News Service collection)