Columbia subject headings:
Forced labor--History.
Russia--Social conditions.
Soviet Union--Social conditions.
Totalitarianism--History.
Harvard subject headings:
Forced labor--History.
Russia--Social conditions.
Slavery--Economic aspects.
Slavery--History
Soviet Union--Social conditions.
Totalitarianism--History.
Princeton subject headings:
Forced labor--History.
Russia--Social conditions.
Slavery--History.
Soviet Union--Social conditions.
Totalitarianism--History.