Columbia subject headings:
European Union countries--Government policy.
Political violence.
Public opinion--European Union countries.
Terrorism--European Union countries--Public opinion.
Harvard subject headings:
European Union countries--Government policy.
Political violence.
Public opinion--European Union countries
Terrorism--Europe
Terrorism--Europe--Prevention
Terrorism--European Union countries--Public opinion.
Terrorism--Government policy--Europe.
Princeton subject headings:
Terrorism--Europe--Government policy.
Terrorism--Europe--Prevention.
Terrorism--Europe.