Columbia subject headings:
Intelligence service--Europe, Eastern--Drama--History--20th century.
Secret service--Europe, Eastern--Drama--History--20th century.
Theater--Europe, Eastern--History--20th century.
Harvard subject headings:
Intelligence service--Europe, Eastern--Drama--History--20th century.
Secret service--Europe, Eastern--Drama--History--20th century.
Theater--Europe, Eastern--History--20th century.
Princeton subject headings:
Intelligence service--Europe, Eastern--Drama--History--20th century.
Secret service--Europe, Eastern--Drama--History--20th century.
Theater--Europe, Eastern--History--20th century.