Columbia subject headings:
Ação Católica Operária (Brazil)--History.
Labor movement--Brazil--History--20th century.
Labor--Religious aspects--Christianity--Brazil--History--20th century.
Harvard subject headings:
Ação Católica Operária (Brazil)--History.
Labor movement--Brazil--History--20th century.
Labor--Religious aspects--Christianity--Brazil--History--20th century.
Princeton subject headings:
Ação Católica Operária (Rio de Janeiro, Brazil)--History.
Catholic labor unions--Brazil--History.
Labor--Religious aspects--Christianity--Brazil--History.