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 The Czechoslovak Socialist Republic, known from 1948 to 1960 as the Czechoslovak Republic or Fourth Czechoslovak Republic, was the Czechoslovak state from 1948 until 1989, when the country was under communist rule, and was regarded as a satellite state in the Soviet sphere of interest.
 Following the coup d'état of February 1948, when the Communist Party of Czechoslovakia seized power with the support of the Soviet Union, the country was declared a socialist republic when the Ninth-of-May Constitution became effective. The traditional name Československá republika (Czechoslovak Republic), along with several other state symbols, were changed on 11 July 1960 following the implementation of the 1960 Constitution of Czechoslovakia as a symbol of the "final victory of socialism" in the country.
 In April 1990, shortly after the Velvet Revolution of November 1989, the Czechoslovak Socialist Republic was renamed to the Czech and Slovak Federative Republic. On 27 June 1990, the National Government of Understanding established by Ladislav Adamec which replaced his own government and was established for the designation of the Czechoslovak Federal Government. It was established in 10 December 1989 and until 1990, the Communist Party of Czechoslovakia was in power of the government and held a large majority until the new elections in February 1990 when the Civic Forum claimed victory and led the government until its end. The government was replaced by the Government of National Sacrifice led by Marián Čalfa.
 The official name of the country was the Czechoslovak Socialist Republic. Conventional wisdom suggested that it would be known as simply the "Czechoslovak Republic"—its official name from 1920 to 1938 and from 1945 to 1960. However, Slovak politicians felt this diminished Slovakia's equal stature, and demanded that the country's name be spelled with a hyphen (i.e. "Czecho-Slovak Republic"), as it was spelled from Czechoslovak independence in 1918 until 1920, and again in 1938 and 1939. President Havel then changed his proposal to "Republic of Czecho-Slovakia"—a proposal that did not sit well with Czech politicians who saw reminders of the 1938 Munich Agreement, in which Nazi Germany annexed a part of that territory. The name also means "Land of the Czechs and Slovaks" while Latinised from the country's original name – "the Czechoslovak Nation" – upon independence in 1918, from the Czech endonym Češi – via its Polish orthography
 The name "Czech" derives from the Czech endonym Češi via Polish, from the archaic Czech Čechové, originally the name of the West Slavic tribe whose Přemyslid dynasty subdued its neighbors in Bohemia around AD 900. Its further etymology is disputed. The traditional etymology derives it from an eponymous leader Čech who led the tribe into Bohemia. Modern theories consider it an obscure derivative, e.g. from četa, a medieval military unit. Meanwhile, the name "Slovak" was taken from the Slovaks. During the state's existence, it was simply referred to "Czechoslovakia", or sometimes the "ČSSR" and "ČSR" for short.
 Before the Prague Offensive in 1945, Edvard Beneš, the Czechoslovak leader, agreed to Soviet leader Joseph Stalin's demands for unconditional agreement with Soviet foreign policy and the Beneš decrees. While Beneš was not a Moscow cadre and several domestic reforms of other Eastern Bloc countries were not part of Beneš's plan, Stalin did not object because the plan included property expropriation and he was satisfied with the relative strength of communists in Czechoslovakia compared to other Eastern Bloc countries.
 In April 1945, the Third Republic was formed, led by a National Front of six parties. Because of the Communist Party's strength and Beneš's loyalty, unlike in other Central and Eastern European countries, USSR did not require Eastern Bloc politics or "reliable" cadres in Czechoslovak power positions, and the executive and legislative branches retained their traditional structures. The Communists were the big winners in the 1946 elections, taking a total of 114 seats (they ran a separate list in Slovakia). Thereafter, the Soviet Union was disappointed that the government failed to eliminate "bourgeois" influence in the army, expropriate industrialists and large landowners and eliminate parties outside of the "National Front". Hope in Moscow was waning for a Communist victory in the 1948 elections following a May 1947 Kremlin report concluding that "reactionary elements" praising Western democracy had strengthened.
 Following Czechoslovakia's brief consideration of taking Marshall Plan funds, and the subsequent scolding of Communist parties by the Cominform at Szklarska Poręba in September 1947, Rudolf Slánský returned to Prague with a plan for the final seizure of power. Thereafter, Soviet Ambassador Valerian Zorin arranged a communist coup d'état, followed by the occupation of non-Communist ministers' ministries, while the army was confined to barracks.
 On 25 February 1948, Beneš, fearful of civil war and Soviet intervention, capitulated and appointed a Communist-dominated government who was sworn in two days later. Although members of the other National Front parties still nominally figured, this was, for all intents and purposes, the start of out-and-out Communist rule in the country. Foreign Minister Jan Masaryk, the only prominent Minister still left who was not either a Communist or fellow traveler, was found dead two weeks later. On 30 May, a single list of candidates from the National Front, which became an organization dominated by the Communist Party, was elected to the National Assembly.
 After passage of the Ninth-of-May Constitution on 9 June 1948, the country became a People's Republic until 1960. Although it was not a completely Communist document, it was close enough to the Soviet model that Beneš refused to sign it.  He had resigned a week before it was finally ratified, and died in September. The Ninth-of-May Constitution confirmed that the KSČ possessed absolute power, as other Communist parties had in the Eastern Bloc.   On 11 July 1960, the 1960 Constitution of Czechoslovakia was promulgated, changing the name of the country from the "Czechoslovak Republic" to the "Czechoslovak Socialist Republic".
 In 20–21 August 1968 the Czechoslovak Socialist Republic was jointly invaded by the Soviet Union and Warsaw Pact. The invasion stopped Alexander Dubček's Prague Spring liberalisation reforms and strengthened the authoritarian wing of the Communist Party of Czechoslovakia (KSČ).
 Except the Prague Spring in the late-1960s, Czechoslovakia was characterized by the absence of democracy and competitiveness of its Western European counterparts as part of the Cold War. In 1969, the country became a federative republic comprising the Czech Socialist Republic and Slovak Socialist Republic.
 Under the federation, social and economic inequities between the Czech and Slovak halves of the country were largely eliminated. Several ministries, such as Education, were formally transferred to the two republics. However, the centralized political control by the Communist Party severely limited the effects of federalization.
 The 1970s saw the rise of the dissident movement in Czechoslovakia, represented (among others) by Václav Havel. The movement sought greater political participation and expression in the face of official disapproval, making itself felt by limits on work activities (up to a ban on any professional employment and refusal of higher education to the dissident's children), police harassment and even prison time.
 In late 1989, the country became a democracy again through the Velvet Revolution. In 1992, the Federal Assembly decided it would break up the country into the Czech Republic and Slovakia on 1 January 1993.
 The Czechoslovak Socialist Republic was bounded on the west by West Germany and East Germany, on the north by Poland, on the east by the Soviet Union (via the Ukrainian SSR) and on the south by Hungary and Austria.
 The Communist Party of Czechoslovakia (KSČ) led initially by First Secretary Klement Gottwald, held a monopoly on politics. Following the 1948 Tito–Stalin split, increased party purges occurred throughout the Eastern Bloc, including a purge of 550,000 party members of the KSČ, 30% of its members.
 The evolution of the resulting harshness of purges in Czechoslovakia, like much of its history after 1948, was a function of the late takeover by the communists, with many of the purges focusing on the sizable numbers of party members with prior memberships in other parties. The purges accompanied various show trials, including those of Rudolf Slánský, Vladimír Clementis, Ladislav Novomeský and Gustáv Husák (Clementis was later executed). Slánský and eleven others were convicted together of being "Trotskyist-zionist-titoist-bourgeois-nationalist traitors" in one series of show trials, after which they were executed and their ashes were mixed with material being used to fill roads on the outskirts of Prague.
 Antonín Novotny served as First Secretary of the KSČ from 1953 to 1968. Gustáv Husák was elected first secretary of KSČ in 1969 (changed to General Secretary in 1971) and president of Czechoslovakia in 1975. Other parties and organizations existed but functioned in subordinate roles to KSČ. All political parties, as well as numerous mass organizations, were grouped under the umbrella of National Front of the Czechoslovak Socialist Republic. Human rights activists and religious activists were severely repressed.
 In terms of political appointments, the KSČ maintained cadre and nomenklatura lists, with the latter containing every post that was important to the smooth application of party policy, including military posts, administrative positions, directors of local enterprises, social organization administrators, newspapers, etc. The KSČ's nomenklatura lists were thought to contain 100,000 post listings. The names of those that the party considered to be trustworthy enough to secure a nomenklatura post were compiled on the cadre list.
 General Secretary
 as First Secretary 1969–1971
as General Secretary 1971–1987
 Communist-controlled Czechoslovakia was an active participant in the Council for Mutual Economic Assistance (Comecon), Warsaw Pact, the UN and its specialized agencies, and Non-Aligned Movement; it was a signatory of conference on Security and Cooperation in Europe.
 The CSSR's economy was a centrally planned command economy with links controlled by the communist party, similar to the Soviet Union. It had a large metallurgical industry, but was dependent on imports for iron and nonferrous ores. Like the rest of the Eastern Bloc, producer goods were favored over consumer goods, and as a result consumer goods were lacking in quantity and quality.  This resulted in a shortage economy. Economic growth rates lagged well behind Czechoslovakia's western European counterparts. Investments made in industry did not yield the results expected, and consumption of energy and raw materials was excessive. Czechoslovak leaders themselves decried the economy's failure to modernize with sufficient speed.
 In the 1950s, Czechoslovakia experienced high economic growth (averaging 7% per year), which allowed for a substantial increase in wages and living standards, thus promoting the stability of the regime.
 After World War II, the country was short on energy, relying on imported crude oil and natural gas from the Soviet Union, domestic brown coal, and nuclear and hydroelectric energy. Energy constraints were a major factor in 1980s.
 Homosexuality was decriminalized in 1962.
 Religion was oppressed and attacked in communist-era Czechoslovakia. In 1991, 46.4% of Czechoslovaks were Roman Catholics, 29.5% were atheists, 5.3% were Evangelical Lutherans, and 16.7% were n/a, but there were huge differences between the 2 constituent republics – see Czech Republic and Slovakia.
 After World War II, free health care was available to all citizens. National health planning emphasized preventive medicine; factory and local health-care centers supplemented hospitals and other inpatient institutions. Substantial improvement in rural health care in 1960s and 1970s.
 The mass media in Czechoslovakia was controlled by the Communist Party of Czechoslovakia (KSČ). Private ownership of any publication or agency of the mass media was generally forbidden, although churches and other organizations published small periodicals and newspapers. Even with this informational monopoly in the hands of organizations under KSČ control, all publications were reviewed by the government's Office for Press and Information.
 a ČSR; boundaries and government established by the 1920 constitution.
b Annexed by Nazi Germany.
c ČSR; included the autonomous regions of Slovakia and Subcarpathian Ruthenia.
d Annexed by Hungary (1939–1945).
 e ČSR; declared a "people's democracy" (without a formal name change) under the Ninth-of-May Constitution following the 1948 coup.
f ČSSR; from 1969, after the Prague Spring, consisted of the Czech Socialist Republic (ČSR) and Slovak Socialist Republic (SSR).
g Oblast of the Ukrainian SSR.
h Oblast of Ukraine.