Columbia subject headings:
Latin America--Politics and government--20th century.
Political parties--South America.
South America--Politics and government--20th century.
Working class--South America.
Harvard subject headings:
Labor--South America.
Political parties--South America.
South America--Politics and government--20th century
Working class--South America.
Princeton subject headings:
Labor--South America.
Political parties--South America.
South America--Politics and government--20th century.