The People's Republic of Bulgaria (PRB; Bulgarian: Народна република България, НРБ, romanized: Narodna republika Bŭlgariya, NRB; pronounced [nɐˈrɔdnɐ rɛˈpublikɐ bɐɫˈɡarijɐ]) was the Bulgarian state that existed from 1946 to 1990, ruled by the Bulgarian Communist Party (BCP; Bulgarian: Българска комунистическа партия (БКП)) together with its coalition partner, the Bulgarian Agrarian People's Union. Bulgaria was also part of Comecon as well as a member of the Warsaw Pact. The Bulgarian resistance movement during World War II deposed the Tsardom of Bulgaria administration in the Bulgarian coup d'état of 1944 which ended the country's alliance with the Axis powers and led to the People's Republic in 1946.
The BCP modeled its policies after those of the Soviet Union, transforming the country over the course of a decade from an agrarian peasant society into an industrialized socialist society. In the mid-1950s and after the death of Stalin, the party's hardliners lost influence and a period of social liberalization and stability followed under Todor Zhivkov. Varying degrees of conservative or liberal influence followed. After a new energy and transportation infrastructure was constructed, by 1960 manufacturing became the dominant sector of the economy and Bulgaria became a major exporter of household goods and later of computer technologies, earning it the nickname of "Silicon Valley of the Eastern Bloc". The country's relatively high productivity levels and high scores on social development rankings made it a model for other socialist countries' administrative policies.
In 1989, after a few years of liberal influence, political reforms were initiated and Zhivkov, who had served as head of the party since 1954, was removed from office in a BCP congress. In 1990, under the leadership of Aleksandar Lilov, the BCP changed its name to the Bulgarian Socialist Party (BSP) and adopted social democracy and democratic socialism in place of Marxism–Leninism. The BSP won the June 1990 election, which was the first openly contested multi-party election since 1931. The first elected president Zhelyu Zhelev was inaugurated on 1 August and became the first oppositional president of Bulgaria in the People's Republic. On 15 November the People's Republic of Bulgaria was officially renamed to the Republic of Bulgaria. On 12 July 1991 with the new Constitution of Bulgaria all the symbols of the People's Republic of Bulgaria were officially dissolved.
Geographically, the People's Republic of Bulgaria had the same borders as present-day Bulgaria and it bordered the Black Sea to the east; Romania to the north; Yugoslavia (via SRs Serbia and Macedonia) to the west and Greece and Turkey to the south.
On 1 March 1941, the Kingdom of Bulgaria signed the Tripartite Pact, and officially became a member of the Axis. Following the German invasion of Yugoslavia and Greece in April, Bulgaria came to occupy large parts of those countries. In 1942, the anti-Axis resistance movement Fatherland Front was formed from a mixture of Communists, Socialists, left-wing Agrarians and members of Zveno. The estimate for the number of partisans (armed guerrilla fighters) at any one time in Bulgaria is 18,000.
In 1944, with the entry of the Red Army into Romania, the Kingdom of Bulgaria renounced the Axis and declared neutrality. On 5 September, the Soviet Union declared war on the kingdom and three days later the Red Army entered north-eastern Bulgaria, prompting the government to declare support in order to minimise military conflict. On 9 September, communist guerrillas launched a coup d'état which de facto ended the rule of the Bulgarian monarchy and its administration, after which a new government assumed power led by the Fatherland Front, which itself was led by the Bulgarian Communist Party.
Early years and Chervenkov era
After taking power, the Fatherland Front formed a coalition led by former Prime Minister Kimon Georgiev, which included the Social Democrats and the Agrarians. Under the terms of the peace settlement, Bulgaria was allowed to keep Southern Dobruja, but formally renounced all claims to Greek and Yugoslav territory. 150,000 Bulgarians settled during the occupation were expelled from Western Thrace. The Communists deliberately took a minor role in the new government at first, though an all-Communist regency council was set up for the young Tsar Simeon II. The Soviet representatives held the real power. A Communist-controlled People's Militia was set up, which harassed and intimidated non-Communist parties.
On 1 February 1945, Regent Prince Kiril, former Prime Minister Bogdan Filov, and hundreds of other officials of the kingdom were arrested on charges of war crimes. By June, Kirill and the other Regents, twenty-two former ministers, and many others had been executed. The new government began to arrest Nazi collaborators. Thousands of people were charged with treason or participating in counter-revolutionary conspiracy and sentenced to either death or life in prison. When the army returned following the German surrender, the regime also purged the officer corps. As the war came to a halt, the government expanded its campaign of political revolution to attack economic elites in banking and private business. It is estimated that, between 1944 and 1989, between 5,000 and 10,000 people were killed in Bulgaria as part of agricultural collectivisation and political repression, although documentation is insufficient for a definitive judgement. Figures for fatalities in forced labour camps also remain elusive. According to official sources, 2,730 people have been sentenced to death, but unofficial estimates suggested that as many as 20,000 people were reported killed under the regime between 1944 and 1989.
These revolutionary attacks strengthened when it became apparent that the United States and United Kingdom had little interest in Bulgaria. In November 1945, Communist Party leader Georgi Dimitrov returned to Bulgaria after 22 years in exile. He made a truculent speech that rejected cooperation with opposition groups. Elections held a few weeks later resulted in a large majority for the Fatherland Front.
In September 1946, the monarchy was abolished by plebiscite, which resulted in 95.6 percent voting in favour of a republic, and Simeon was sent into exile. The Communists openly took power, and Bulgaria was declared a People's Republic. Vasil Kolarov, the number-three man in the party, became president. Over the next year, the Communists consolidated their hold on power. Elections for a constituent assembly in October 1946 gave the Communists a majority. A month later, Dimitrov became prime minister.
The Agrarians refused to co-operate with the authorities, and in June 1947 their leader Nikola Petkov was arrested, despite strong international protests. The new Agrarian leader, Georgi Traykov, repudiated his party's traditional ideology and defined a new role for it as the helpmate of the Bulgarian Communist Party. This marked the formation of a Communist establishment in Bulgaria. In December 1947, the constituent assembly ratified a new constitution for the republic, referred to as the "Dimitrov Constitution". The constitution was drafted with the help of Soviet jurists using the 1936 Soviet Constitution as a model. By 1948, the remaining opposition parties were either realigned or dissolved; the Social Democrats merged with the Communists, while the Agrarian Union became a loyal partner of the Communists.
During 1948–1949, Orthodox, Muslim, Protestant and Roman Catholic religious organisations were restrained or banned. Both Protestant and Catholic preachers were frequently accused by Communist prosecutors of having ties to Western intelligence agencies, particularly those of the United States and United Kingdom. The Orthodox Church of Bulgaria continued functioning but never regained the influence it held under the monarchy; many high roles within the church were assumed by communist functionaries.