On April 5, 1911, 400,000 New Yorkers gathered to pay tribute to the victims of the Triangle Shirtwaist Factory fire: the deadliest workplace accident in the city's history. | American Experience | PBS

On March 25, 1911, the Triangle Shirtwaist Factory fire killed 146 workers and injured dozens more. While trying to escape the fire, the workers (most of whom were immigrant women) encountered locked doors and broken fire escapes. The tragedy brought attention to dangerous working conditions, inspiring demands for change over the following decades. In 1970, our Occupational Safety and Health Administration was established to ensure the safety and health of America's workers, and that mission is