Columbia subject headings:
Partīi︠a︡ sot︠s︡īalistov-revoli︠u︡t︠s︡īonerov.
Prisoners--Soviet Union.
Prisons--Soviet Union.
Soviet Union--History--Revolution, 1917-1921--Atrocities.
Harvard subject headings:
Partīi︠a︡ sot︠s︡īalistov-revoli︠u︡t︠s︡īonerov.
Prisoners--Soviet Union.
Prisons--Soviet Union
Princeton subject headings:
Partīi︠a︡ sot︠s︡īalistov-revoli︠u︡t︠s︡īonerov.
Political persecution--Soviet Union.
Political prisoners--Soviet Union.
Prisons--Soviet Union.