Columbia subject headings:
Authors, German--Biography.
Germans--Emigration and immigration--History--20th century.
Germans--United States--History--20th century.
Political refugees--Germany--History--20th century.
Political refugees--United States--History--20th century.
United States. Federal Bureau of Investigation--History.
World War, 1939-1945--Refugees.
Harvard subject headings:
Authors, Exiled--20th century--Mexico.
Authors, Exiled--20th century--United States.
Authors, Exiled--20th century.
Authors, Exiled--Mexico.
Authors, Exiled--United States.
Authors, German--20th century--Political and social views
German literature--20th century--History and criticism
Politics and literature--United States--History--20th century.
United States. Federal Bureau of Investigation--History--20th century.
Princeton subject headings:
Authors, Exiled--20th century--Mexico.
Authors, Exiled--20th century--United States.
Authors, German--20th century--Political and social views.
German literature--20th century--History and criticism.
Politics and literature--United States--History--20th century.
United States. Federal Bureau of Investigation--History--20th century.