Columbia subject headings:
Communism--United States--History--19th century.
Workingmen's Party of the United States--History.
Harvard subject headings:
Communism--United States--History--19th century.
Workingmen's Party of the United States--History.
Princeton subject headings:
Communism--United States--History--19th century.
Workingmen's Party of the United States--History.