SURAT, India — The crowds surged through the gates, fought their way up the stairs of the 160-year-old station, poured across the platforms and engulfed the trains. Thousands of migrant laborers were frantic to leave — loom operators, diamond polishers, mechanics, truck drivers, cooks, cleaners, the backbone of Surat’s economy. Two of them were Rabindra and Prafulla Behera, brothers and textile workers, who had arrived in Surat a decade ago in search of opportunity and were now fleeing disease and death. 