Title: The Camp of the Saints
The Camp of the Saints (French: Le Camp des Saints) is a 1973 French dystopian fiction novel by author and explorer Jean Raspail. A speculative fictional account, it depicts the destruction of Western civilization through Third World mass immigration to France and the West. Almost forty years after its initial publication, the novel returned to the bestseller list in 2011.
In Calcutta, India, Catholic priests promote the adoption of Indian children by those back in Belgium as a form of charity. When the Belgian government realizes that the number of Indian children raised in Belgium has reached 40,000 in just five years, an emergency policy attempts to halt the migration. Desperate for the chance to send their children to what they call a "land of plenty", a mob of desperate Indians swarms the consulate. As a Belgian aid worker works through the crowd, an Indian gong farmer begs him to take them back to Europe, to which the worker agrees.
The worker and farmer bring the crowd to the docks, where there are hundreds of ships once owned by European powers, now suited only for river traffic. Nevertheless, the crowd boards, and a hundred ships soon leave for Europe; conditions on board are cramped, unsanitary and miserable, with some passengers publicly fornicating(The rest to be found in the book itself).
(Sourced from Wikipedia)