also been allegations that Cuban DI agents interrogated U.S. POWs held at the Cu Loc POW camp in North Vietnam. Chile Shortly after the election of Salvador Allende as president of Chile in November 1970, the DI worked extremely closely to strengthen Allende's increasingly precarious position. The Cuban DI station chief Luis Fernández Oña married Allende's daughter Beatriz, who later committed suicide in Cuba. Grenada Shortly after a popular bloodless coup in Grenada, led by Maurice Bishop, the Cuban DI sent advisers to the island nation to assist the new government. The DI was also instrumental in persuading the Soviet Union to aid Grenada, aid that Grenadian general Hudson Austin called essential to the success of the Caribbean anti-imperialist movement. The DI coordinated 780 Cuban engineers and intelligence operatives. Nicaragua Beginning in 1967 the DI had begun to establish ties with various Nicaraguan revolutionary organizations. The Soviets were upset at what they saw as Cuba upstaging the KGB in Nicaragua. By 1970 the DI had managed to train hundreds of Sandinista guerrilla leaders and had vast influence over the organization. In 1969 the DI had financed and organized an operation to free the jailed Sandinistan leader Carlos Fonseca from his prison in Costa Rica. Fonseca was captured shortly after the jail break, but after a plane carrying executives from the United Fruit Company was hijacked by the Sandinista National Liberation Front (FSLN), he was freed and allowed to travel to Cuba. DI chief Manuel Piñeiro commented that "of all the countries in Latin America, the most active work being carried out by us is in Nicaragua." The DI, with Fidel Castro's personal blessing, also collaborated with the FSLN on the botched assassination attempt of Turner B. Shelton, the U.S. ambassador in Managua and a close friend to the Somoza family. The FSLN managed to secure several hostages, exchanging them for safe passage to Cuba and a $1 million ransom. After the successful ousting of Anastasio Somoza, DI involvement in the new Sandinista government expanded rapidly. An early indication of the central role that the DI would play in the Cuban–Nicaraguan relationship a meeting in Havana on 27 July 1979, at which diplomatic ties between the two countries were re-established after over 25 years. Julián López Díaz, a prominent DI agent, was named ambassador to Nicaragua. Cuban military and DI advisers initially brought in during the Sandinistan insurgency, would swell to