Eight Lebanese citizens, all Shiite Muslims, have been charged with "terrorism" in the UAE and denied legal representation in a trial "marred with violations", Human Rights Watch said Monday.
While the charges have not been made public, families of the eight men say they were charged with terrorism, according to New York-based HRW.
UAE media reported that they are linked to Lebanese Shiite group Hezbollah.
Although the Iran-backed Hezbollah holds three cabinet posts and is 13 seats in the Lebanese parliament, it is blacklisted as a terrorist organisation by the United Arab Emirates.
A representative of the UAE government could not be immediately reached for comment.
Family members told HRW the defendants had been held in solitary confinement for prolonged periods and denied legal representation and visits by their relatives.
"Time and again, the UAE has used the spectre of terrorism to justify its utter lack of respect for the rule of law," said Sarah Leah Whitson, Middle East director at HRW.
"By not respecting the rights of the defendants to a fair trial, the Emirati authorities are indicating that they have already decided the outcome."