Sunday marks the 107th anniversary of the Triangle Shirtwaist fire.

Hundreds gathered outside the site of the deadly blaze in Greenwich Village Friday to commemorate the somber anniversary.

One hundred and forty-seven people died when the Triangle Shirtwaist Factory caught fire on March 25, 1911.

Workers could not escape the building because many stairwells and exit doors were locked.

Most of the victims were female immigrants.

Labor union advocates say those victims helped revolutionize new labor safety laws that help protect workers today.

"The triangle fire was the fire that changed America," said organizer Sean Mackell. "It was the fire that brought in different rules on how we govern and making sure that workers go to work under safe conditions."

Singers from the New York City Labor Choir and from the On Site Opera's Morning Star sang a musical tribute to commemorate the tragedy.

The FDNY was also on hand to toll bells as the names of those who were killed were read aloud.