Columbia subject headings:
Harvard subject headings:
Ex-convicts--Soviet Union--Societies, etc.--Congresses.
Political prisoners--Russia--Societies, etc.--Congresses.
Vsesoi︠u︡znoe obshchestvo politicheskikh katorzhan i ssylʹnoposelent︠s︡ev (Soviet Union)--History--Congresses.
Princeton subject headings:
Ex-convicts--Soviet Union--Societies, etc.--Congresses.
Political prisoners--Soviet Union--Societies, etc.--Congresses.
Vsesoi︠u︡znoe obshchestvo politicheskikh katorzhan i ssylʹnoposelent︠s︡ev (Soviet Union)