He is president of one of Venezuela’s most popular and insurgent websites, DolarToday.com, which provides a benchmark exchange rate used by his compatriots to buy and sell black-market dollars. That allows them to bypass some of the world’s most rigid currency controls.
Socialist President Nicolás Maduro has accused DolarToday of leading an “economic war” against his embattled government and vowed to jail Mr. Díaz and his two partners, also Venezuelan expatriates in the U.S. The Venezuelan central bank unsuccessfully filed suit against the website twice in U.S. courts. The government has also turned to hackers to launch constant attacks, Mr. Díaz said, forcing the site to use sophisticated defenses.
Mr. Díaz is a U.S.-trained retired colonel, and he indeed tried to overthrow Mr. Maduro’s predecessor, Hugo Chávez, by participating in a short-lived coup in 2002.