havana armando hart head cuban revolution literacy campaign serve decades education culture minister fidel castro die sunday respiratory failure age 87 cuban state media report hart marxist intellectual lawyer fight urban underground imprison last year revolution u.s.-backed dictator fulgencio batista marry haydee santamaria 1980 heroine revolution one important female figure two children die automobile accident 2008. hart also member communist party political bureau council state many years two powerful executive body cuba 1997 hart become director national center preserve memory work jose marti country venerate figure position hold death castro ally intellectual armando hart dead 87