A group of Cuban men in Mexico was charged with smuggling people to the United States. One of its leaders said Raúl Castro’s grandson helped, according to interviews and court records.

© Jae C. Hong/Associated Press

The Castro family envoy, Raúl G. Rodríguez Castro, who has been in talks with the Trump administration, was once named in a case targeting a Cuban smuggling ring.

© Francois Mori/Associated Press

Some officials warn that a more hard-line leader could emerge if the Trump administration moves forward with its plans.

© Lisette Poole González for The New York Times

Some officials warn that a more hard-line leader could emerge if the Trump administration moves forward with its plans.

© Lisette Poole González for The New York Times