Columbia subject headings:
Radicalism--France--Congresses.
Radicalism--Great Britain--Congresses.
Right and left (Political science)--Congresses.
Right-wing extremists--France--Congresses.
Right-wing extremists--Great Britain--Congresses.
Harvard subject headings:
Radicalism--France
Radicalism--Great Britain
Right-wing extremists--France.
Right-wing extremists--Great Britain.
Princeton subject headings: