The Republic of Bulgaria is a parliamentary democracy. The constitution vests legislative authority in the unicameral National Assembly (Narodno Sabranie). A coalition government headed by a prime minister led the country. Observers characterized the parliamentary elections in May as complying "with the fundamental freedoms of expression, association, and assembly" but also noted pervasive allegations of vote buying and a lack of transparency. Authorities maintained effective control over the security forces. Security forces committed human rights abuses, including excessive use of force, arbitrary arrest, and harassment and intimidation. There were allegations of unlawful wiretapping. The marginalization of the Romani minority remained the country's most pressing human rights problem. The continued deterioration of the media environment and increase in media self-censorship due to corporate and political pressure were also problematic. Corruption continued to be a drag on the government's capabilities and undermined public and business confidence in the judiciary and other government institutions. Other human rights problems included overcrowding and harsh conditions in prisons and detention facilities. There were also long delays in the judicial system; reports of abuse of wiretapping; religious discrimination and harassment; harsh conditions in refugee centers; violence and discrimination against women; violence against children; increasing online anti-Semitism; trafficking in persons; discrimination against persons with disabilities; discrimination against members of the Romani and Turkish ethnic minorities; and discrimination against lesbian, gay, bisexual, and transgender (LGBT) persons and persons with HIV/AIDS.