In an increasingly globalized world, international migration has to be seen as a complement to other flows and exchanges taking place between countries. During the last two decades or so, the issue of migration has emerged as one of the most serious crises in industrialized nations. The main reason for this is that, in an era of growing economic globalization, when each state is moving towards border-free economic spaces in the world order, the flow of migrants is largely determined by a global labour market, being more or less impervious to governmental policies. It is ultimately impossible to intensify border controls to keep migrants out, so any attempts by government to restrict the entry of migrants result in the growth of an illegal foreign migrant population. The existence of illegal migrants itself demonstrates an erosion of the state’s sovereignty.