Columbia subject headings:
Radicalism--Germany--Congresses.
Right and left (Political science)--Congresses.
Terrorism--Germany--Congresses.
Harvard subject headings:
Radicalism--Germany--Congresses.
Right and left (Political science)--Congresses
Terrorism--Germany--Congresses.
Princeton subject headings:
Radicalism--Germany--Congresses.
Right and left (Political science)--Congresses.
Terrorism--Germany--Congresses.