On March 25, 1911, fire raced through the 8th, 9th and 10th floors of the Triangle Waist Company in New York City. Inside, workers – largely young immigrant women in their teens and twenties – made the fashionable shirtwaists. Fire ladders and water hoses did not reach beyond the 6th floor. The flames, locked doors and blocked exits trapped workers – and many jumped to their deaths. In all, 146 died. A look back at the tragedy that prompted calls for safety investigations and labor reforms, and that encouraged union organizing efforts.