Columbia subject headings:
Espionage--United States.
Political prisoners--United States--Biography.
Political prisoners--United States--Personal narratives.
Sobell, Morton.
Harvard subject headings:
Espionage--United States.
Political prisoners--United States--Personal narratives.
Political prisoners--United States.
Sobell, Morton
Princeton subject headings:
Espionage--United States.
Political prisoners--United States--Personal narratives.
Sobell, Morton.