Columbia subject headings:
Harvard subject headings:
Internal security--Ukraine--History--Sources.
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--Purges--Sources.
Political persecution--Ukraine--History--Sources.
Political purges--Ukraine--History--Sources.
Secret service--Ukraine--History--Sources.
Soviet Union--Politics and government--1936-1953--Sources.
Soviet Union. Narodnyĭ komissariat vnutrennikh del--Sources.
State-sponsored terrorism--Ukraine--History--Sources.
Terrorism--Ukraine--History--Sources.
Ukraine--History--1921-1944--Sources.
Ukraine. Narodnyĭ komisarii︠a︡t vnutrishnikh sprav--Sources.
Princeton subject headings:
Kommunisticheskai︠a︡ partii︠a︡ Sovetskogo Soi︠u︡za--Purges--Sources.
Political persecution--Soviet Union--History--Sources.
Political purges--Soviet Union--History--Sources.
Soviet Union--Politics and government--1936-1953--Sources.
Soviet Union. Narodnyĭ komissariat vnutrennikh del--History--Sources.
Terrorism--Soviet Union--Sources.