Columbia subject headings:
International law and socialism.
Regionalism (International organization)
Soviet Union--Foreign relations.
Harvard subject headings:
Communism.
International law and socialism.
Internationalism.
Regionalism (International organization)
Soviet Union--Foreign relations--1917-1945.
Soviet Union--Foreign relations.
Princeton subject headings:
International law and socialism.
Regionalism (International organization)
Soviet Union--Foreign relations.