Forced migration in the context of "Polish population transfers (1944–1946)"

Ethnic cleansing is the systematic forced removal of ethnic, racial, or religious groups from a given area, with the intent of making the society ethnically homogeneous. Along with direct removal such as deportation or population transfer, it also includes indirect methods aimed at forced migration by coercing the victim group to flee and preventing its return, such as murder, rape, and property destruction. Both the definition and charge of ethnic cleansing is often disputed, with some researchers including and others excluding coercive assimilation or mass killings as a means of depopulating an area of a particular group, or calling it a euphemism for genocide or cultural genocide.

Although scholars do not agree on which events constitute ethnic cleansing, many instances have occurred throughout history. The term was first used to describe Albanian nationalist treatment of the Kosovo Serbs in the 1980s, and entered widespread use during the Yugoslav Wars in the 1990s. Since then, the term has gained widespread acceptance due to journalism. Although research originally focused on deep-rooted animosities as an explanation for ethnic cleansing events, more recent studies depict ethnic cleansing as "a natural extension of the homogenizing tendencies of nation states" or emphasize security concerns and the effects of democratization, portraying ethnic tensions as a contributing factor. Research has also focused on the role of war as a causative or potentiating factor in ethnic cleansing. However, states in a similar strategic situation can have widely varying policies towards minority ethnic groups perceived as a security threat.

Political cleansing of a population is the elimination of categories of people in specific areas for political reasons. The means of it may vary and they may include acts of political violence, ethnic cleansing, forced migration, genocide political repression, purges, population transfers and terrorism (especially state terrorism and state-sponsored terrorism). Political cleansing has been used by many dictatorships.

The Norwegian Centre for Violence and Traumatic Stress Studies (Norwegian: Nasjonalt kunnskapssenter om vold og traumatisk stress, NKVTS) is a research centre in Oslo, Norway, and Norway's national research institution in violence and sexual abuse; disaster management, terrorism, armed conflicts and traumatic stress; and forced migration and refugee health research. It is interdisciplinary and employs experts mainly in psychology, psychiatry, and the social sciences. In addition to carrying out research and related activities, the institute advises the Government of Norway in its areas of expertise and has some official emergency management functions at the national level. NKVTS has 101 employees.

NKVTS was established by the Government of Norway in 2004 through the merger of four research institutions, mainly at the University of Oslo, and was wholly owned by the University of Oslo until 2019 when ownership was transferred to the Norwegian Research Centre, itself owned by four universities. While organised as an independent limited company, it remains an affiliated institute of the University of Oslo and cooperates closely with the Department of Psychology and the Faculty of Medicine, where several of its research professors also hold professorial chairs. The centre was located at Oslo University Hospital, Ullevål 2004–2013, and is now located in Nydalen, Oslo.

The expulsion of Cham Albanians from Greece was the forced migration and ethnic cleansing of thousands of Cham Albanians from settlements of Chameria in Thesprotia, Greece after the Second World War to Albania, at the hands of elements of the Greek Resistance: the National Republican Greek League (EDES) (1944) and EDES veteran resistance fighters (1945). The causes of the expulsion remain a matter of debate among historians. The estimated number of Cham Albanians expelled from Epirus mostly to Albania varies from 14,000 to 35,000.

In the late Ottoman period, tensions between the Muslim Chams and the local Greek Orthodox Christian population emerged through communal conflicts. The Cham Albanians were originally Christian Orthodox by religion, but converted to Islam during the latter years of the Ottoman occupation. These tensions continued during the Balkan Wars, when the region, then under Ottoman rule, became part of Greece. Before and during the interwar period, the Muslim Chams were not integrated into the Greek state, which adopted policies that aimed to drive them out of their territory, led to tensions between them. Unlike the Christian Albanians of Greece, the Muslim Cham Albanians were seen by Greek nationalists as an immediate threat to the state. Meanwhile, fascist Italian propaganda initiated in 1939 an aggressive pro-Albanian campaign for the annexation of the Greek region and the creation of a Greater Albanian state.

Development-induced displacement and resettlement (DIDR) occurs when people are forced to leave their homes in a development-driven form of forced migration. Historically, it has been associated with the construction of dams for hydroelectric power and irrigation, but it can also result from various development projects such as mining, agriculture, the creation of military installations, airports, industrial plants, weapon testing grounds, railways, road developments, urbanization, conservation projects, and forestry.

Development-induced displacement is a social problem affecting multiple levels of human organization, from tribal and village communities to well-developed urban areas. Development is widely viewed as an inevitable step towards modernization and economic growth in developing countries; however, for those who are displaced, the result is most often loss of livelihood and impoverishment.