During the
Sandinista Revolution, Chamorro sympathized with the rebels, at one point hiding
Sergio Ramírez from the
National Guard. But as the civil war's climax brought fierce fighting to the capital itself, fears for his family's safety led him to leave for
Miami, Florida on 17 June 1979. Somoza fell a month later, but after visiting Nicaragua in September, Chamorro decided to remain in Miami. By late 1979, Chamorro had become involved in the anti-Sandinista activities of the Miami exile community. He joined the
Nicaraguan Democratic Union (UDN), formed the next year by
José Francisco Cardenal, which merged into the
Nicaraguan Democratic Force (FDN) in August 1981. He served on the FDN's political executive committee, which decided to replace Cardenal with a new political directorate. Chamorro was tapped to be a member of the directorate, unveiled at a 8 December 1982 press conference. With his public relations experience, he took on a spokesman role for the FDN, and based himself in
Tegucigalpa, Honduras to liaison with journalists covering the war. Chamorro claimed that the
CIA prepped him before press conferences and told him to deny that the group had received any funding from the US government. Chamorro was miffed when the FDN directorate, at the CIA's prompting, appointed
Adolfo Calero as its president in October 1983. His not-so-private grumblings that his Chamorro lineage was more illustrious than Calero's did not help their deteriorating relations. Chamorro was forced out in November 1984, in the fallout from the furor over the CIA's
Psychological Operations in Guerrilla Warfare, labeled by the press a "murder manual." He turned against the rebel movement, even submitting an affidavit for the Sandinista government before the
International Court of Justice in
Nicaragua v. United States. ==After the war==