Opposition to the PDG continued, however, and in September 1990, two coup attempts were uncovered and aborted. Economic discontent and a desire for political liberalization provoked violent demonstrations and strikes by students and workers in early 1990. In response to grievances by workers, Bongo negotiated with them on a sector-by-sector basis, making significant wage concessions. In addition, he promised to open up the PDG and to organize a national political conference in March–April 1990 to discuss Gabon's future political system. The PDG and 74 political organizations attended the conference. Participants essentially divided into two loose coalitions, the ruling PDG and its allies and the United Front of Opposition Associations and Parties, consisting of the breakaway Morena Fundamental and the Gabonese Progress Party.