Columbia subject headings:
Europe--Politics and government--21st century.
New Left--Europe--21st century.
Right and left (Political science)--Europe--21st century.
Socialism--Europe--21st century.
Harvard subject headings:
Political science--Europe--21st century.
Socialism--Europe--21st century.
Princeton subject headings:
Political parties--Europe--History--21st century.
Political science--Europe--21st century.
Socialism--Europe--21st century.
Socialist parties--Europe--History--21st century.