Demonstrators demand sweeping, systemic political change before any presidential vote takes place.
Demonstrators want root-and-branch political reform and the departure of the country's ruling elite.
Election set to take place eight months after former President Abdelaziz Bouteflika resigned following mass protests.
Ministro Esteri Boukadoum, 'vorremmo regione fosse luogo pace'
All five candidates in next week's vote are considered part of the political elite, linked to Abdelaziz Bouteflika.
Exceptional trial, which is being televised, comes at a time of renewed political tensions in the oil rich country.
Army chief Ahmed Gaid Salah says the military will not support any candidate in presidential polls expected in December.
Judges began an open-ended strike on October 27 demanding independence for the judiciary after a massive reshuffle.
Demonstrators reject call by powerful army chief to hold presidential election by December and demand his removal.
Selezionati tra 22 che hanno presentato la proposta