Because the doors to the stairwells and exits were locked (a then-common practice to prevent workers from taking unauthorized breaks and to reduce theft), many of the workers who could not escape from the burning building jumped from the high windows.
Who was the elevator operator in the Triangle Shirtwaist fire?
Elevator operators Joseph Zito and Gaspar Mortillaro saved many lives by traveling three times up to the 9th floor for passengers, but Mortillaro was eventually forced to give up when the rails of his elevator buckled under the heat.