The Central Committee of the 27th Congress of the Communist Party of the Soviet Union was in session from 1986 until 1990. Its 1st Plenary Session elected the Politburo, the Secretariat and the Party Control Committee of the 27th Congress of the Communist Party of the Soviet Union.

History Election and composition The 27th Congress witnessed the greatest turnover of Central Committee members in the party's history since 22nd Party Congress (held in 1961) during Nikita Khrushchev's leadership. The numbers of full membership were reduced from 319 in the 26th Central Committee to 307, while candidate membership was increased from 151 to 170. Of the 307 full members elected to the 27th Central Committee, 102 (making up 33 percent of membership) were newcomers. 25 officials, who had previously served as candidate members in the 26th Central Committee, were promoted to full membership. In total 125 new full members were appointed, making up 41 percent. 182 members (59 percent) were reelected to the 27th Central Committee, a decrease from the 26th Congress, in which 238 (75 percent) were reelected. Of the 170 candidate members, 54 (32 percent) were reelected, while the other 116 were newcomers. The 1st Plenary Session elected Lev Zaykov (then First Secretary of the Leningrad City Party Committee) to full membership in the Politburo, while Nikolay Slyunkov (Communist Party of Byelorussia First Secretary) and (First Secretary of the Leningrad Regional Party Committee) were given Politburo candidate membership. The plenum elected five newcomers to the Secretariat; Alexandra Biryukova (the first women to hold high party office since Yekaterina Furtseva in the Khrushchev era), Anatoly Dobrynin, , Georgy Razumovsky and Alexander Yakovlev. The 1st Plenary Session reelected Mikhail Gorbachev to the office of the general secretary.

In a similar vein, Gorbachev managed to get close advisers elected to the Central Committee. Anatoly Chernyaev (Gorbachev's foreign adviser) and Anatoly Lukyanov, (head of the party's General Department) were promoted to full membership, while Valery Boldin was elected to the 27th Central Committee as a candidate member. Several figures within the Central Academy of Social Sciences, most notably Evgeny Velikhov, were appointed to the Central Committee as candidate members. Notably the 27th Congress did not reelect Richard Kosolapov, the longtime editor of the party's theoretical journal Kommunist, and was replaced by Ivan Frolov. Several Brezhnev appointed heads of Central Committee departments failed to be reelected to the Central Committee; (Agricultural-Machine Building Department), Kirill Simonov (Transport and Communications Department) and (Culture Department). Nikolay Savkin (Administrative Organs Department) and (Agriculture and Food Industry Department) were the two last remaining Central Committee departments heads appointed by Brezhnev. Of the 23 department heads, fourteen were replaced by the 1st Plenary Session. Four leading officials from the Brezhnev era, who retired from the Politburo and the Secretariat at the 27th Congress, were reelected to the Central Committee; Nikolai Tikhonov (former chairman of the Council of Ministers), Nikolai Baibakov (the former chairman of the State Planning Committee), Boris Ponomarev (former head of the International Department) and Vasili Kuznetsov (the former first deputy chairman of the Presidium of the Supreme Soviet).

Tenure Combating party formalism; 1st–2nd Plenary Sessions The newly elected leadership was united in supporting reforms, principally behind the slogan uskoreniye (literally "acceleration"), which called for improving the Soviet economy, and to combat formalism, corruption, nepotism and centralism within the party. Beginning in March 1985, the Central Committee (through the Soviet press) began criticizing the norms and organizational habits of the party; criticism increased by the discovery of corruption rings in the communist parties of Kazakhstan (CPK, Kirghizia (CPKi), Turkmenistan (CPT), Moldavia (CPM), Uzbekistan (CPU) and Azerbaijan (ACP). The policy of appointing officials on the basis of "personal loyalty, servility and protectionism" were blamed on the party's subpar performance in certain areas, and in areas in which this was not the case, the Central Committee focused on the lack of inner-party democracy. To strengthen party democracy, Gorbachev called for an increase in criticism and self-criticism (claiming it was as critical "for us as air") to overcome "'paradeness, ballyhoo . . . [and] the embellishment of reality". An article in Pravda noted that "In some places people try to 'prepare' the discussion in such a way as to avoid any tricky issues in it. Speeches are usually made only by 'staff' speakers, usually in a predetermined order. Things even go as far as the editing of draft texts of speeches." Meetings became ceremonial, and lacked effective power—which led local authorities to misinform the central authorities on the situation in the given area. All forms of "window-dressing", or hiding abuses of power in general, were to be stopped. In the current situation, Solovyev noted; The main demand which the party makes under modern conditions on the party committee secretary and the staff officer is ensuring that nowhere, under no circumstances, does word part from deed since any discrepancy here causes palpable damage to the authority of our policy and cannot be tolerated in any form. Boris Griaznov, the First Secretary of the Frunze District Party Committee, was signalled out as an official "'accustomed to stagnation, encouraged ostentation, ignored collective opinion, lost the feeling of party comradeship, and only pretended to be carrying out restructuring", while party leaders in Kazakhstan had difficulty of ridding"themselves of elements of excessive administration and a commander-like style [behaviour]". The central leadership continued to highlight the party work ethics of first secretaries at every level; at the 2nd Plenary Session Gorbachev condemned certain localities of not committing themselves to the new work-style. In other cases, as noted by Gorbachev, party leaders did not know how to react to criticism or how to introduce changes, noting that "Sometimes words are substituted for deeds, no action is taken in response to criticism, and self-criticism takes the form of self-flagellation." Historian Graeme Gill asserts; "complaints about the way in which the party was operating which resounded through the press in 1985 and 1986 amounted to a condemnation of the party's organisational culture. [...] During the first eighteen months or so of Gorbachev's tenure as General Secretary, there seems to have been a general underestimation of the strength and sources of this culture and of what was necessary to eradicate it. The heart of the solution the Gorbachev leadership pursued was thoroughly traditional in the Soviet context, personnel.

Collectivity of leadership, and collectivism in general, was hailed as "a reliable guarantee against the adoption of volitional, subjective decisions, manifestations of the cult of personality, and the infringement of Leninist norms of party life." In tandem, the Central Committee began calling for psychological restructuring of party members. However, since the 27th Congress failed to create institutions which oversaw the implementation of these measures (and others), individual members who had no interest in changing their work habits were not punished. The reason for the lack of oversight was Gorbachev's belief that the party was a "healthy organism", and as Graeme Gill concludes, "A healthy organism clearly did not need radical institutional surgery." When it became clear to Gorbachev that the reforms to "invigorate" the party had failed, the reform consensus within the leadership was split asunder. Gorbachev began moving in a more radical directions, while several prominent colleagues in the Politburo, Secretariat and the Central Committee opposed his new measures. The schism in the leadership led to the failure to convene the 3rd Plenary Session in the last half of 1986 (being postponed to January 1987). Nonetheless, before the 3rd Plenary Session, the Central Committee was able to remove Dinmukhamed Konayev, the CPK First Secretary. The removal of Konayev, who was widely perceived to support an out-dated work ethic and to be corrupt, led to the Jeltoqsan riots when it was discovered that Konayev would be replaced by Gennady Kolbin, an ethnic Russian who had never lived in the Kazakh Soviet Socialist Republic.

Democratization: 3rd–7th Plenary Sessions On 23 December 1985, the Politburo appointed Boris Yeltsin, an official from Sverdlovsk, First Secretary of the Moscow City Committee (de facto mayor of Moscow). Gorbachev had endorsed the appointment, heeding the advice of Yegor Ligachev (the party's informal second-in-command) who personally recommended him. In contrast, Nikolai Ryzhkov told Gorbachev in private that "He [Yeltsin] will cause you only grief. I would not recommend him." Yeltsin, who had introduced himself as something of a centrist at the 27th Congress, proved himself to be a supporter of radical change, going even as far, as on 19 January 1986, of criticising Gorbachev personally for "exaggerat[ing] the changes that had occurred" during his leadership.

Gorbachev opened the 3rd Plenary Session by criticising the party's performance, claiming the party's failure to reform was due to "conservatism and inertia, lenience and lack of demandingness, toadyism and personal adulation, red tape, formalism, intolerance and suppression of criticism, ambition and careerism, administration by decree, permissiveness, mutual coverups, careerism, departmentalism, parochialism, nationalism, substitutionism, a weakening of the role of party meetings and elective bodies, embezzlement, bribery, report-padding and violation of discipline." The cure for this "disease" was "demokratizatsiya", literally the democratization of society. He called for open, democratic debates in the primary party organizations and to allow a secret ballot during plenary sessions of the district, area, city, region and territory party committees and the central committees of the republican parties to elect the executive organs. This was an attack on the nomenklatura, a system in which leading officials appointed the cadres at the level below, the basis of the Soviet system. The plenary session opposed his suggestions, and while his criticisms were mentioned in the Resolution of the 3rd Plenary Session, the idea of multi-candidate elections within the Party were omitted from the text.

In preparation of the 4th Plenary Session, Gorbachev had prepared a speech on Soviet and Party history. In it he condemned the rule of Joseph Stalin and Stalinism in general, but the speech was amended by Politburo. Conservatives such as Ligachev, Andrei Gromyko, Mikhail Solomentsev and Vitaly Vorotnikov did not share Gorbachev's views, or at least, did not support a public anti-Stalinist proclamation. Despite the conservative reaction, Gorbachev was able to rehabilitate Nikolay Bukharin and Nikita Khrushchev, while referring to Stalin's repressive regime as "immense and unpardonable".