Columbia subject headings:
Harvard subject headings:
Houston (Tex.)--History.
Internal security--Texas--Houston--History--20th century.
Right and left (Political science)
Subversive activities--Texas--Houston--History--20th century.
Princeton subject headings:
Houston (Tex.)--History.
Internal security--Texas--Houston--History--20th century.
Subversive activities--Texas--Houston--History--20th century.