Columbia subject headings:
Communists--Soviet Union--Biography.
Efimov, I. I. (Ivan Ivanovich)
Political prisoners--Soviet Union--Biography.
Soviet Union--Politics and government.
Harvard subject headings:
Efimov, I. I. (Ivan Ivanovich)--Biography.
Princeton subject headings:
Communists--Soviet Union--Biography.
Efimov, I. I. (Ivan Ivanovich)
Political prisoners--Soviet Union--Biography.
Soviet Union--Politics and government.