Columbia subject headings:
Harvard subject headings:
Germany--Politics and government--20th century
Kommunistische Partei Deutschlands--History.
Labor unions and communism--Germany--History--20th century.
Spartakusbund (Germany)--History.
Working class--Germany--History--20th century
Princeton subject headings:
Germany--Politics and government--20th century.
Kommunistische Partei Deutschlands--History.
Labor unions and communism--Germany--History--20th century.
Spartakusbund (Germany)--History.
Working class--Germany--History--20th century.