premise: Fidel Castro transferred his responsibilities.
hypothesis: Fidel Alejandro Castro Ruz ( [ fiˈðel aleˈhandɾo ˈkastɾo ˈrus ] ; August 13 , 1926 -- November 25 , 2016 ) was a Cuban revolutionary and politician who governed the Republic of Cuba as Prime Minister from 1959 to 1976 and then as President from 1976 to 2008 . Politically a Marxist -- Leninist and Cuban nationalist , he also served as the First Secretary of the Communist Party of Cuba from 1961 until 2011 . Under his administration , Cuba became a one-party socialist state ; industry and business were nationalized , and state socialist reforms were implemented throughout society . In 2006 he transferred his responsibilities to Vice-President Raúl Castro , who was elected to the presidency by the National Assembly in 2008 .