Columbia subject headings:
Betrayal--Congresses.
Betrayal--Social aspects--Congresses.
Defectors--Congresses.
Traitors--Congresses.
Treason--History--Congresses.
Harvard subject headings:
Betrayal--Congresses.
History, Ancient--Congresses
Traitors--Congresses.
Treason--History--Congresses.
Princeton subject headings:
Betrayal--Congresses.
Traitors--Congresses.
Treason--History--Congresses.