Columbia subject headings:
Communism--United States.
Poor--United States.
Unemployed--United States.
United States--Economic conditions--1918-1945.
United States--Social conditions--1933-1945.
Working class--United States.
Harvard subject headings:
Communism--United States
Communism--United States--History--20th century
Poor--United States
Unemployed--United States
United States--Economic conditions--1918-1945.
United States--Social conditions--1933-1945.
United States--Social conditions.
Working class--United States
Working class--United States--History--20th century
Princeton subject headings:
Communism--United States.
Labor movement--United States.
Poor--United States.
Unemployed--United States.
United States--Economic conditions--1918-1945.
United States--Social conditions--1933-1945.