Columbia subject headings:
Communism--Greece--History--20th century.
Communism--United States--History--20th century.
Communists--Greece--History--20th century.
Communists--United States--History--20th century.
Emigration and immigration.
Greece--Social conditions--20th century.
Greeks--United States--History--20th century.
Immigrants--Greece--History--20th century.
Immigrants--United States--History--20th century.
Labor movement--United States--History--20th century.
United States--Social conditions--20th century.
Working class--Greece--History--20th century.
Working class--United States--History--20th century.
Harvard subject headings:
Communism--Greece--History--20th century.
Communism--United States--History--20th century
Communists--Greece--History--20th century.
Communists--United States--History--20th century.
Emigration and immigration
Greece--Social conditions--20th century.
Greeks--United States--History--20th century.
Immigrants--Greece--History--20th century.
Immigrants--United States--History--20th century
Labor movement--United States--History--20th century
United States--Social conditions--20th century.
Working class--Greece--History--20th century.
Working class--United States--History--20th century
Princeton subject headings:
Communism--Greece--History--20th century.
Communism--United States--History--20th century.
Communists--Greece--History--20th century.
Communists--United States--History--20th century.
Emigration and immigration.
Greece--Social conditions--20th century.
Greeks--United States--History--20th century.
Immigrants--Greece--History--20th century.
Immigrants--United States--History--20th century.
Labor movement--United States--History--20th century.
United States--Social conditions--20th century.
Working class--Greece--History--20th century.
Working class--United States--History--20th century.