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

Earlier this month, the city of New York unveiled a memorial to the lives lost in the 1911 Triangle Shirtwaist Factory Fire. One of the deadliest workplace disasters in U.S. history, the fire was a turning point for the labor movement and spurred improved safety measures for workers. | American Experience | PBS