Their letter to the UAE's president, released by activists today, comes after the prosecution wrapped up its case this week, claiming the Emirati suspects are linked to Islamist networks opposed to the country's Western-backed ruling system.
The charges reflect wider crackdowns across the Gulf Arab states.
The letter repeats claims of torture and harassment of their families. It says their Islamic society, known as Al-Islah, had the backing of UAE leaders in the past and is loyal to the UAE's leadership.
A verdict in the trial is expected later this month.