On March 25, 1911, a fire at the Triangle Shirtwaist Factory in New York City killed 146 garment workers on the eighth, ninth, and tenth floors of the building.

The door to the only stairwell leading from the ninth floor was locked (allegedly by the owners, to prevent workers from leaving early), and the tallest ladders of the New York Fire Department trucks would only reach the sixth floor.

The Kheel Center for Labor-Management Documentation and Archives shares its collection relating to the tragedy.