Columbia subject headings:
Dissenters--Soviet Union.
Political prisoners--Soviet Union--Biography.
Soviet Union--Politics and government.
Underground literature--Soviet Union.
Harvard subject headings:
Dissenters--Soviet Union
Political prisoners--Soviet Union--Biography
Soviet Union--Politics and government--1917-1936.
Underground literature--Soviet Union.
Princeton subject headings:
Dissenters--Soviet Union.
Political prisoners--Soviet Union--Biography.
Soviet Union--Politics and government.
Underground literature--Soviet Union.