On this date, Soviet troops reached Warsaw and took over the city. On 12/31/1944, a provisional government had been established, a coalition of leftist parties controlled by the communist Polska Partia Robotnicza (Polish Worker’s Party, PPR). The provisional government announced on this date governed a substantial part of Poland, from which the Soviets had driven German troops. It faced no serious domestic challenges because of the defeat in October 1944 of the Warsaw uprising led by the Home Army. We code this regime change event as a foreign-imposed regime change, specifically as an occupation rather than a liberation by foreign forces, since Soviet forces did not support the Warsaw Uprising but waited for its defeat in order to install a pro-Soviet government after the Nazi retreat.9 After the Home Army’s defeat, Mikolajczyk, premier of the Polish government-in-exile in London, agreed to negotiate with the communists. When other members of the government-inexile refused to support his compromise, he resigned from the government-in-exile. He joined the communist dominated coalition in 1945. Although non-communist leaders held some formally important positions in this and later governments, the communists held control. Through their control of the security forces and the Interior Ministry, they assured the repression and disorganization of more popular parties and won the 1947 election (Hiscocks 1963: 87-91, 101-6, Lukas 1982: 4-8, 20-28, 70-75, Geddes/Wright/Frantz 2014: 89). The communist regime in Poland ascended to power with the coercive apparatus being under Soviet control (Johnson 1981: 8, Naimark 2010: 178). Stalin covertly established the Polish National Liberation Committee (PKWN) by recruiting former Polish Communists residing in Moscow Naimark, 2010 #32794: 178}. In Poland as elsewhere in Eastern Europe, Soviet military missions oversaw the reorganization of military forces, embedded commanders, advisers, and technicians within the armed forces and defense ministries and purged pre-communist officer corps (Johnson 1981: 2, 7-8). In the early 1950s, the defense minister, chief of the general staff, commander of the ground forces, heads of all service branches, and commanders of all four military districts were former Soviet officers (Johnson 1981: 08). Soviet troops remained in Poland throughout the entire communist regime’s tenure (Barany 2016: 101). Throughout the history of the communist regime in Poland, there were riots against it. On 10/21/1956 the communist party denounced Ochab’s handling of the riots and what they called his political opportunism. Gomulka was instated as party secretary. In the face of a stagnating post-war economy, Polish Communist leader Władysław Gomułka, the First Secretary of the Polish United Workers’ Party (PZPR), decided to end government subsidies for food and other everyday items in late 1970.10 On 12/14 to 12/19/1970 riots over wages were violently suppressed under Gomułka which led to the Communist party ousting him from leadership positions.11 Edward Gierik became his successor. On 09/06/1980 a new round of price increase riots exacerbated by the formation of the Solidarity movement and prompted the communist party to remove the aging Gierek replacing him with Kania. By the beginning of 1981, Solidarity boasted a membership exceeding 10 million people, encompassing nearly 80% of the total workforce. In that year, Solidarity organized its inaugural national congress, during which Lech Walesa, a key figure in the union’s establishment, was elected president.12 On 10/12/1981 Kania was ousted from his position by the communist party under pressure from the USSR because of his inability to tackle Solidarity and for his anti-Soviet comments. General Wojciech Jaruzelski assumed power and declared martial law. The Military Council of National Salvation, a military junta, was established. It consisted of 21 members: fifteen generals, one admiral and five colonels.13 However, since the takeover of a general occurred in the framework of the communist regime it is not classified as a regime change (to a military autocracy). In the beginning of 1982, the Citizens’ Committees of National Salvation were formed, composed mostly of PZPR members. In July 1982, they joined the newly formed Patriotic Movement for National Rebirth.13 According to LIED, only executive elections were held until 1946, but they were not categorized as multiparty. In 1947 multiparty executive and legislative elections were conducted and from 1948 onward, both executive and legislative elections were held but they were not categorized as multiparty. Per FH, from 1972 to 1979, the country scores between 11 and 14 as not free, which we also interpret as not free. As classified by FH in 1980, the country scores between 9 and 10 as not free, which we interpret as rather not free. As classified by FH from 1981 to 1986, the country is scored from 11 to 14 as not free, which corresponds to our interpretation of not free. Per FH’s evaluation from 1987 to 1988, the country scores from 9 to 10 as not free, which we categorize as rather not free. From 1947 to 1980, according to Polity5, during this period, the executive encountered slight limitations on decision-making power imposed by other institutions. In 1981 and 1982, the executive’s constraints fell into Intermediate Category 1, between unlimited authority and slight limitations. From 1983 to 1988, the executive’s authority was subject to minor institutional constraints. For 1944-1986, V-Dem’s JCE is interpreted by us as indicating that judicial constraints on the executive were moderate, while V-Dem’s LCE is classified by us as indicating that legislative constraints on the executive were absent. For 1987 and 1988, V-Dem’s JCE is classified by us as indicating that judicial constraints on the executive were robust, whereas V-Dem’s LCE is classified by us as indicating that legislative constraints on the executive were absent. For the given period, LIED identifies political liberties as absent, and V-Dem’s PCLI is also classified by us as indicating that political liberties are absent and are not really present from 1980 and 1981 and since 1986.