Fascinating article. Two planes collide and 70 people are killed. There was one overworked air traffic controller working 15 planes: he made 118 radio contacts with them, and he was guiding another plane into land.
The father of 3 of the victims of the crash later murdered the air traffic controller.
Now 4 people from the private air traffic control firm have been found guilty of manslaughter.
There’s also on article about it on Wikipedia.