Columbia subject headings:
Soviet Union--Relations--Spain.
Soviet Union. Narodnyĭ komissariat vnutrennikh del.
Spain--History--Civil War, 1936-1939--Participation, Russian.
Spain--Relations--Soviet Union.
Harvard subject headings:
Princeton subject headings:
Intelligence service--Soviet Union--History--20th century.
Military participation--Russian.
Russians--Spain--Biography.
Russians--Spain--History--20th century.
Soviet Union--Foreign relations--Spain.
Soviet Union. Narodnyĭ komissariat vnutrennikh del--Officials and employees--Biography.
Spain--Foreign relations--Soviet Union.
Spain--History--Civil War, 1936-1939--International brigades.
Spain--History--Civil War, 1936-1939--Participation, Russian--Sources.
Spain--History--Civil War, 1936-1939--Participation, Russian.
Starinov, I. G. (Ilʹi︠a︡ Grigorʹevich)
Syroezhkin, Grigoriĭ Sergeevich.