Adela Dworin, president of the Beth Shalom Synagogue in Havana, and David Prinstein, the synagogue’s vice president, met with Gross, 62, at hospital.

Court said prosecutors proved case that Gross was working on a subversive program, paid for by the U.S., that aimed to bring down Cuba's revolutionary system.

The U.S. businessman stands accused of illegally bringing communications equipment into Cuba aimed at overthrowing the government of President Raul Castro.