When Sebastian Arcos and family members tried to travel from Cuba to the United States, authorities stopped them in what turned out to be a sting operation to arrest one of his uncles, who had advocated and fought for Fidel Castro’s revolution more than 20 years earlier. That was Dec. 31, 1981, and for trying to leave the island nation, Arcos was jailed for a year. His uncle spent seven years in jail. His father, also a political supporter of the communist revolution and like many other citizens soured on the broken promises of democracy, was imprisoned for six years....