The correct answer is - Cuban property owners.
Lots of the Cuban property owners fled the country after Fidel Castro took over. They were on the opinion that Castro's government will not last long, so that their move to the United States was temporary, and they left their properties, families, business behind. As it turned out, Castro's government did not fell, and they made a law with whom they confiscated the properties and businesses of all people that were not living in the country, so the people that left the country stayed permanently in the United States.