Columbia subject headings:
Harvard subject headings:
Germany (East)--Politics and government.
Opposition (Political science)--Germany (East)--History--20th century.
Political persecution--Germany (East)--History--20th century.
Sozialistische Einheitspartei Deutschlands--History.
Princeton subject headings:
Opposition (Political science)--Germany (East)--History--20th century.
Political persecution--Germany (East)--History--20th century.