As someone else pointed out. The triangle shirtwaist factory fire.
But as another example of businesses doing shitty things that led to people dying. The Iroquois Theater fire in Chicago. They didn’t want poor people changing seats to nicer ones so locked the doors to those areas when the play started and they bribed people to not finish their fire safety equipment but still get approved to open. Hundreds died.
Yea. If I remember my fires correctly, this one also has doors that opened into the theater so as mobs of people pushed to get out, the doors jammed and couldn’t be opened. It directly led to the regulation for outward swinging egress doors and “crash” hardware. Which are those bars on exit doors so in an emergency people can just crash into them and they open.