The nationalist Popular Front won the first free parliamentary elections in the Moldavian SSR in early 1990, and its agenda started slowly to be implemented. On 2 September 1990, the Pridnestrovian Moldavian Soviet Socialist Republic (PMSSR) was proclaimed as a Soviet republic by an ''ad hoc'' assembly, the Second Congress of the Peoples' Representatives of Transnistria, following a successful referendum. Violence escalated when in October 1990 the Popular Front called for volunteers to form armed militias to stop an autonomy referendum in Gagauzia, which had an even higher share of ethnic minorities. In response, volunteer militias were formed in Transnistria. In April 1990, nationalist mobs attacked ethnic Russian members of parliament, while the Moldovan police refused to intervene or restore order.