I highly recommend the movie, Born into Brothels [0]. It's set in Sonagachi, in some sense the analogue of Kamathipura in Calcutta.
Crumbling concrete congestion aside Sonagachi is quite different. Here sex workers are self organized, have a political voice and are unionised. The latest form of which is
https://en.m.wikipedia.org/wiki/Durbar_Mahila_Samanwaya_Comm...
[0] https://m.imdb.com/title/tt0388789/
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