Columbia subject headings:
Harvard subject headings:
Labor unions--United States--Political activity.
Latin America--Foreign relations--United States.
Socialists--United States--Political activity.
United States--Foreign relations--Latin America.
United States--Military policy.
Princeton subject headings:
Labor unions--United States--Political activity.
Latin America--Foreign relations--United States.
Socialists--United States--Political activity.
United States--Foreign relations--Latin America.
United States--Military policy.