The advent of perestroika allowed the Abkhaz an outlet to express their dissatisfaction of their status within Georgia. In 1988 a letter, signed by leading Abkhazians, was forwarded to Mikhail Gorbachev and the Soviet leadership. It outlined the grievances the Abkhaz felt and argued that despite the concessions of 1978, autonomy had largely been ignored in the region. It concluded by asking for Abkhazia to be removed from the Georgian SSR, and it to be restored as a full Soviet republic, akin to the SSR Abkhazia. This was followed in March 1989 with the Lykhny Declaration, which was a document signed by some 37,000 people. This led to protests in Georgia, which culminated into a massive major anti-Soviet and pro-Georgian independence rally in Tbilisi on 9 April 1989, which was violently dispersed by Soviet Interior Ministry troops, resulting in the deaths of twenty, mostly young women, and the injury of hundreds of demonstrators. The 9 April tragedy removed the last vestiges of credibility from the Soviet regime in Georgia and pushed many Georgians into radical opposition to the Soviet Union, and exacerbated ethnic tensions between Georgians and other groups, in particular the Abkhaz and Ossetians. Further riots in Sukhumi opposing the establishment of a branch of the Tbilisi State University exacerbated Abkhaz nationalism.