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Within member states of the EU) the phrase "third country nationals" (TCN) is used to refer to non-EU nationals while in a EU member state.
Terms to use for subject searches in SOLO:
Political refugees -- Civil rights
Immigrants -- Civil rights
Refugees -- Civil rights
Aliens -- Civil rights
Specific subject searches to try in SOLO:
Stateless persons Legal status, laws, etc.
Citizenship, Loss of
But also try the broader classifications:
Stateless persons
Statelessness