This paragraph doesn't get to the point until the third sentence about the "new arrival". This is the sentence that actually says who these people are.
18. All over town one can see crowds of men, women, and children who seem to move together like a herd of sheep. They huddle together or they rush across the street in a mob, or they gather in a group, shouting and jabbering. These are the new arrivals in the city. They have come to Calcutta because of famine, flood, drought, or other causes. They are homeless and hopeless when they reach the city. They get along in Calcutta as people have always managed in a new place.
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