Columbia subject headings:
Harvard subject headings:
Radicalism--Europe--History--20th century--Congresses.
Radicalism--United States--History--20th century--Congresses.
Right-wing extremists--Europe--History--20th century--Congresses.
Right-wing extremists--United States--History--20th century--Congresses.
Princeton subject headings:
Radicalism--Europe--History--20th century--Congresses.
Radicalism--United States--History--20th century--Congresses.
Right-wing extremists--Europe--History--20th century--Congresses.
Right-wing extremists--United States--History--20th century--Congresses.