Here in Chicago we had the Projects...
they became so dilapidated and dangerous that
they all had to be torn down.
I'm sure most big cities have had similar experiences.
7
Pruitt Igoe of St. Louis, the most famous housing project disaster. My wife stayed their as a small child.
It was required reading in Architecture College.
https://en.wikipedia.org/wiki/Pruitt%E2%80%93Igoe