Columbia subject headings:
Harvard subject headings:
Human smuggling--Europe--Case studies.
Human trafficking--Europe--Case studies.
Human trafficking--Hungary.
Human trafficking--Poland.
Human trafficking--Ukraine.
Hungary--Emigration and immigration.
Poland--Emigration and immigration
Ukraine--Emigration and immigration.
Princeton subject headings:
Europe--Emigration and immigration.
Hungary--Emigration and immigration.
Illegal immigration.
Noncitizens--Europe.
Noncitizens--Hungary.
Noncitizens--Poland.
Noncitizens--Ukraine.
Noncitizens.
Poland--Emigration and immigration.
Smuggling--Europe.
Smuggling--Hungary.
Smuggling--Poland.
Smuggling--Ukraine.
Ukraine--Emigration and immigration.