In April 1980, following the banning of a conference by writer Mouloud Mammeri on traditional Kabyle poetry, riots and strikes broke out in Tizi Ouzou, followed by several months of demonstrations on university campuses in Kabylia and Algiers, known as the Berber Spring, demanding the officialisation and recognition of the Tamazight language. These resulted in the extrajudicial imprisonment of thousands of Kabylie intellectuals, along with other clashes in Tizi-Ouzou and Algiers in 1984 and 1985. With the opening up and establishment of the multi-party system in 1989, the RCD (Rally for Culture and Democracy) party was created by Saïd Sadi, at the same time as identity politics and the cultural awakening of the Kabylians were intensifying in reaction to the increasingly hard-line Arabization. In the midst of the civil war, there was an act of massive civil disobedience beginning in September 1994 and lasting the entire school year until mid 1995 where the ten-million strong population of Kabylia conducted a total school boycott, known as the "schoolbag strike". In June and July 1998 the region flared up again after the assassination of protest singer and political activist Lounès Matoub at the same time that a law requiring the use of Arabic in all fields of education entered into force, further worsening tensions.