They had two children: a daughter, Nella (1931–1995), and a son, Giulio (1936–1997), named after Enrico's older brother, who had died in 1915.
In 1938, the Fermis emigrated to the United States to escape the anti-Jewish laws of the Fascist government of Benito Mussolini; Laura was Jewish. Though Fermi's prestige and membership in the Royal Academy of Italy could have mitigated the impact of the laws, they chose to leave instead. They traveled to Stockholm to receive Fermi's Nobel prize, and left from Stockholm for the United States, where Fermi had accepted a position at Columbia University. They were naturalized as Americans in 1944.
In 1954 Laura resumed writing. Her book Atoms in the Family, about her life with Enrico, appeared shortly before he died of stomach cancer.
In August 1955 Laura traveled to Geneva for the International Conference for the Peaceful Use of Atomic Energy. She was the Official Historian of the Conference and published Atoms for the World, reporting on its proceedings.
Her book Illustrious Immigrants was about "Many of Europe's most intelligent and best-trained men and women, who immediately became visible to middle class America as neighbors, teachers and colleagues" in the years 1930 to 1941. They were, "men and women who came to America fully made, so to speak, with their PhD's and diplomas from art academies or music conservatories in their pockets, and who continued to engage in intellectual pursuits in this country." She noted, "Life was initially hard for many physicians, but it was the lawyers whose training proved least exportable and who most frequently had to find a new means of livelihood." Considering the extent of the influence of the immigrants, an evaluation of the impact of the migration is restricted to two fields: psychoanalysis and nuclear science.
Laura Fermi died in 1977.
- 1936: (with Ginestra Amaldi) Alchemia del Tempo Nostro (Italian)
- 1954: Atoms in the Family: My Life with Enrico Fermi, University of Chicago Press ISBN 0-88318-524-5
- 1957: Atoms for the World: United States participation in the Conference on the Peaceful uses of Atomic Energy, University of Chicago Press, ISBN 0-88318-524-5
- 1961: Mussolini, University of Chicago Press
- 1961: The Story of Atomic Energy, Random House
- 1961: (with Gilberto Bernardinini) Galileo and the Scientific Revolution, Basic Books ISBN 0-486-43226-2
- 1968: Illustrious Immigrants: The Intellectual Migration from Europe 1930–41, University of Chicago Press, ISBN 0-226-24378-8 via Internet Archive
- Bruzzaniti, Giuseppe (2016). Enrico Fermi: The Obedient Genius. Springer. ISBN 9781493935338.
- Laura Fermi from Atomic Heritage Foundation
- Atoms for the World from Kirkus Reviews
- Alice Kimball Smith (10 May 1968) "The Transplantation of European Intellectuals", Science 160: 636–8 doi:10.1126/science.160.3828.636
- Lawrence Badash, J.O. Hirschfelder & H.P. Broida editors (1980) Reminiscences of Los Alamos 1943–1945 (Studies in the History of Modern Science), Springer, ISBN 90-277-1098-8.