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Illegal immigration is migration into a country in violation of the immigration laws of that country. Illegal immigration raises many political, economic and social issues and has become a source of major controversy in more developed countries as well as moderately developed countries. United Nations signatories have agreed to exempt refugees from criminal charges upon such entry, which is in accordance with the Universal Declaration of Human Rights wherein is stated that "Everyone has the right to seek and to enjoy in other countries asylum from persecution". In 2010, the International Organization for Migration estimated that 25.5 to 32.1 million people of the world's total 214 million international migrants are undocumented immigrants, though the IOM notes that it is difficult to make accurate estimates. Proposed economic models of illegal immigration include varying considerations and degrees of complexity. (via Freebase)