For some people it was a period of great prosperity with the boom in manufacturing, but with this increase in industry and also with the rise in population cities could become very overcrowded and unsanitary.
And despite centuries of Western stigma about unsanitary Eastern toilet habits and the so-called 'dirty left hand', (which, by the way, is washed afterward) , science says that Narayan Singh may have had a point.
They surrounded the whole area with a three-metre wall topped with barbed wire and stopped food supplies from entering, trapping everyone in overcrowded and unsanitary conditions.