Take the worst or grimmest and darkest side of society, give them a place where all their sins are given free roam to be expressed, and collect it into a system that can just barely sustain itself and you get the Wretched Hive. The Wretched Hive has a few Sub Tropes in increasing size: Opposite of the Sugar Bowl and Utopia in general, and Shining City more specifically. Often paired with Crapsack World, but differs in that while the setting is less than ideal, the people in it need not be unhappy or universally sociopathic, nor is the worst result the most likely to happen.