Columbia subject headings:
Noncitizens--Europe--Civil rights.
Noncitizens--Europe--Political activity.
Harvard subject headings:
Citizenship--Europe
Naturalization--Europe.
Noncitizens--Civil rights--Europe.
Noncitizens--Europe--Political activity.
Princeton subject headings:
Noncitizens--Europe--Civil rights.
Noncitizens--Europe--Political activity.