What is the main conflict in The Harvest by Tomas Rivera?

"The Harvest" (Arte Público Press, 1989) is a short story by Mexican American writer Tomás Rivera. Rivera was the first writer to document the experience of Mexican American migrant farm workers who each year traveled north from Texas to the Midwest to find seasonal work. Rivera, who was the son of Mexican immigrants, had been a migrant worker in his youth, at various times living and working in Iowa, the Dakotas, Minnesota, Michigan, Wisconsin, and Ohio. He therefore knew firsthand the difficult lives such workers had to endure, and still do today. Migrant workers are among the lowest paid of U. S. workers and they often work long hours in difficult conditions.