The first researcher ever to be allowed access to Fonseca's unpublished writings (collected by the Institute for the Study of Sandinism in the early 1980s and now in the hands of the Nicaraguan Army), Zimmermann also obtained personal interviews with Fonseca's friends, family members, fellow combatants, and political enemies. Unlike previous scholars, Zimmermann sees the Cuban revolution as the crucial turning point in Fonseca's political evolution. Furthermore, while others have argued that he rejected Marxism in favor of a more pragmatic nationalism, Zimmermann shows how Fonseca's political writings remained committed to both socialist revolution and national liberation from U.S. imperialism and followed the ideas of both Che Guevara and the earlier Nicaraguan leader Augusto Cesar Sandino. She further argues that his philosophy embracing the experiences of the nation's workers and peasants was central to the FSLN's initial platform and charismatic appeal.