to reveal on what were the lives of migrant workers
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This reveals that the migrant workers are incredibly lonely. The migrant workers have no family with them and friendships are short lived. When the work dries up, they move on in search of more. Work during the depression was so hard to come by that men did not want any "trouble" with their employer so the kept to themselves. A sense of loneliness permeates this whole novel. Trust is illusive, if it exists at all.