"We're very worried because each time there's a terrorist act, some voices... Say that if there's terrorism you have to put human rights aside," Abdessatar Ben Moussa, the head of the Tunisian Human Rights League, told AFP in an interview just hours before the award ceremony.
The National Dialogue Quartet is made up of the Human Rights League, the Tunisian General Labour Union (UGTT), the Confederation of Industry, Trade and Handicrafts (UTICA), and the Order of Lawyers.
The group orchestrated a lengthy and thorny "national dialogue" between the Islamists of the Ennahda party and their opponents.
"The best way to fight terrorism is to respect human rights," Ben Moussa said.
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He ruled out a return to an autocratic regime like the one that preceded Tunisia's revolution in 2010, saying numerous rights were now cemented in the constitution adopted in January 2014.
While the wave of Arab Spring uprisings has led to chaos in neighbouring Libya, Yemen and Syria, and to the return of repression in Egypt, Tunisia has been held up as a success story.
Last week, Amnesty International expressed concern over the subsequent wave of arrests and detentions, saying it was "a troubling sign that the authorities are reverting to repressive and abusive measures".