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Illegal migration is a global phenomenon, and, as part of international migration in general, it aids in the global interconnectedness that links North and South regions of the world. The term illegal migration can be defined as border crossing that takes place in contravention of laws and regulations on the entry into, the journey through, and/or the departure from the national territories of states or without the legal residence and/or employment permit or authorization of these states. Although illegal migration includes illegal emigration and illegal immigration, the literature on the topic concentrates on the latter. Thus, illegal immigration is generally referred to as a form of migration by which migrants enter, live, and/or work in a country without the necessary permits and/or valid documents (e.g., identity cards, passports, visas, work permits).

The main research interests in the field of illegal migration studies center on the link between illegal migration and human smuggling, labor markets, social policy, national security, immigration control, and human rights. Expanding economic globalization processes encourage illegal migration, which is considered a challenge to the sovereignty of nation-states in terms of governing, regulating, and controlling the transnational movement of citizens and noncitizens in and out of their territories and across their borders.

Terminology

There is a certain amount of controversy over the use of relevant terminology and concepts. A number of terms are used to describe the phenomenon. Undocumented, irregular, and unauthorized are the most commonly used terms besides illegal. Other expressions include clandestine, extra-legal, and sans papiers. Whereas some authors use these terms synonymously, others reject certain expressions because they perceive them incorrect or derogatory. The term illegal has been criticized for several reasons. First, it has been argued that due to its connection with criminality, it should not be applied to migrants who commit infringements of certain regulations rather than serious crimes. Second, this criminalization and delegitimization of migrants is seen as leading to exclusion, undermining the humanity of migrants and potentially jeopardizing valid asylum claims. In addition, it has been pointed out that only an act and not a person can be “illegal.” However, other authors prefer the term illegal as a legal term. The expression is used widely in media, governmental, and EU reports and documents. Nevertheless, the use of the term irregular—although seldom used in public debates—has become widespread in scientific publications and major international institutions and organizations on migration such as the International Organization for Migration, the Global Commission for International Migration, the United Nations High Commissioner for Refugees, the Organization for Security and Co-operation in Europe, and the International Labour Organization.

Types of Illegal Migration

Several different forms of, and routes into, illegality for a migrant exist. Those include illegal entry, residence, and employment as well as combinations of these. The most common forms are the following:

  • Entering a country illegally without immigration inspection (by sea, air, or land and individually or with the help of human smugglers)
  • Entering a country seemingly legally with fraudulent identity documents
  • Entering a country legally (e.g., on a tourist visa) but remaining in the country after the visa expires (overstayers)
  • Entering a country legally on a visa but then violating visa conditions (e.g., taking up work that the type of visa does not permit)
  • Remaining in a country after an asylum claim has been rejected and the migrant has been ordered to leave the country

The boundaries between legality and illegality can be blurred, can change (repeatedly) over time, and can depend on the legal regulations of the destination country or region. For instance, the stay of citizens from countries candidate to EU membership who are residing illegally in the European Union suddenly become legal when their countries of origin join the European Union. However, this does not mean that their illegal employment automatically becomes legal.

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