Columbia subject headings:
American Federation of Teachers.
National Education Association of the United States.
Teachers' unions--United States.
Teachers--Political activity--United States.
Harvard subject headings:
American Federation of Teachers.
National Education Association of the United States.
Teachers' unions--United States.
Teachers--United States--Political activity.
Princeton subject headings:
American Federation of Teachers.
National Education Association of the United States.
Teachers' unions--United States.
Teachers--United States--Political activity.