Galvez called on law-enforcement authorities to investigate the threats and keep them informed.

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Galvez, a Republican state representative in Utah sponsored a bill earlier this year to allow for the state to recognize gold and silver coins as legal tender.

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"Sunday they performed medical check-ups, did paperwork for the passports and told us to be ready starting today, " Irene Viera, the wife of community organiser Julio Cesar Galvez, told AP.

BBC: Freed Cuban dissidents arrive in Spain

The first flight, operated by Air Europa, landed at Madrid's Barajas airport with Lester Gonzalez, Omar Ruiz, Antonio Villarreal, Julio Cesar Galvez, Jose Luis Garcia Paneque and Pablo Pacheco on board at 1249 local time (1049 GMT).

BBC: Freed Cuban dissidents arrive in Spain