Former parties
 Former parties
 Former parties
 The Brazilian Communist Party (Portuguese: Partido Comunista Brasileiro), originally the Communist Party of Brazil (Partido Comunista do Brasil), is a communist party in Brazil, founded on 25 March 1922. Arguably the oldest active political party in Brazil, it played an important role in the country's 20th-century history despite the relatively small number of members. A factional dispute led to the formation of PCdoB (Communist Party of Brazil) in the 1960s, though both communist parties were united in opposition to the Brazilian military government that ruled from 1964 to 1985. But with the fall of the Soviet Union and the collapse of communism circa 1990, the party lost power and international support. An internal coup in 1992 divided the party and formed a new party, called Popular Socialist Party, using the former identification number of the PCB, 23. That party has since moved towards the centre and now goes by the name Cidadania.
 The youth organization of the PCB is the Communist Youth Union and is a member of the World Federation of Democratic Youth.
 The Brazilian Communist Party (in Portuguese, Partido Comunista Brasileiro), abbreviated as the PCB, was founded on 25 March 1922 in the city of Niterói, Rio de Janeiro. On that day, nine representatives of communist groups from the cities of São Paulo, Santos, Cruzeiro, Porto Alegre, Recife, Niterói, Juiz de Fora and Rio de Janeiro met and approved the party's statutes and the twenty-one conditions for entering the Communist International, though the PCB was not recognized by the Comintern in its first years due to its eclectic ideological roots. The meeting ended with all seventy-three members of the party singing L'Internationale.
 The PCB's first years were marked by an effort to encourage socialist thinking in Brazil. There had been moderate socialist parties, newspapers and congresses, but much unlike the strong social-democratic parties that existed in many European countries. The radical anti-capitalist thinking had been dominated by anarchists and anarcho-syndicalists, who also dominated the labour movement, such as in the case of the 1917 anarchist actions in São Paulo. Inspired by the Russian Revolution, a group of former anarchist militants who were disappointed in the lack of unity and force of the movement, turned communist and started the PCB. At the same time, some other figures from Brazil's early labour and socialist movements became inspired by forms of military and authoritarian populism, like the tenentes, that eventually led to the Vargas-revolution of 1930.
 During the first years, the party was declared illegal by the government. On 1 May 1925, during the party's Second Congress, its weekly newspaper A Classe Operária (The Working Class) was announced, with five thousand copies being sold on the factories. This number grew to nine thousand copies by the ninth edition, but the police shut the newspaper down shortly after the twelfth edition was published. The paper reappeared in 1928, after the Third Congress was held.
 By 1930, after being recognized by the Communist International and with its Socialist Youth division formed, the PCB had nearly eleven hundred members. This marks the beginning of a long period of submission to, initially the Third International, and, after its dissolution, to the political leadership of the Communist Party of the Soviet Union. This decade also marked two cycles on the party's history: one of increasing influence, until 1935, and one of decline, until 1942. Both cycles are comprehensible when seen in the context of the Vargas era.
 In 1943, during the so-called Mantiqueira Conference, the party secretly met in the small city of Engenheiro Passos, Rio de Janeiro, and in an open letter to Vargas decided to support a declaration of war on the Axis. At the same time, Luís Carlos Prestes was elected to the party's presidency. In 1945, after Vargas's dictatorship ended, the PCB became legal once again. By 1947, it had nearly two hundred thousand members. In the 1947 legislative election, it received 480,000 votes or about 9% of total votes cast. However, this period of official tolerance did not last long, as President Dutra denounced the PCB as "internationalist, and therefore not committed to Brazil's own interests" in 1948, an action supported by the American government.
 In the 1950s, as the party was driven underground, it began supporting major workers' strikes around Brazil. However, this did not prevent the beginning of internal clashes between different factions within the PCB. This became more evident after the Soviet Communist Party's 20th Congress, when Nikita Khrushchev denounced Joseph Stalin's policies. The factionalization of the party accelerated after a new Manifesto was passed in 1958, proposing new ways of achieving communist goals. This Manifesto linked the establishment of socialism to the broadening of democracy. Some of its top leaders, dissatisfied with the new Soviet line, quit the PCB and formed a new party, Communist Party of Brazil (Partido Comunista do Brasil – PCdoB) in 1962.
 In the mid-1960s the U.S. State Department estimated the number of organized communists in Brazil to around 31,000.
 With this new orientation, the PCB grew in size and exercised a much greater role in the Brazilian left. However, the alliance forged with the other parties did not survive the 1964 Brazilian coup d'état. PCB did play an important role against the dictatorship, by organizing the workers movement and participating in efforts to unite the opposition in its demands for democratic reforms. At that point in time the communists were a fraction of the democratic opposition front, the Brazilian Democratic Movement (MDB). It refused, for example, to engage in armed struggle, differently from other left wing organizations that decided to follow that path. The clandestine operations and the political disputes regarding the strategies to resist the military regime led to many important leaders leaving the party, while many others died in the hands of the military regime. To the end of the dictatorship, while the Communist Party in Brazil was involved in several internal clashes, the Worker's Party (Partido dos Trabalhadores) was founded. Its creation was the project of a series of left wing groups independent from the PCB (Trotskyists, communist dissidents, ex-guerrillas, sectors of the Catholic Left, independent unionists and intellectuals). It was structured as an alternative to Communist-led unionism in Brazil. Forswearing the Popular Front strategy adopted by the PCB, the PT chose instead to take a more radical stance against the military regime and gained a strong presence in between high skilled workers and middle-class intellectuals. The growth of the PT accelerated the fragmentation process inside the PCB leading ultimately to a big split.
 After the 1979 amnesty, the PCB's leaders began to restructure the party. The 1982 Congress confirmed its democratic agenda, declaring the PCB "a party of the masses, linking socialist goals to true democracy, which will be constructed based on the values of freedom". Once again, internal clashes developed in the party, as it was passing through a process of renewal while its influence in society declined. The fall of the Eastern Bloc was also a strong blow to the party, turning the renewal process into one where Marxism began to be abandoned by party leaders. This crisis reached its high point in January 1992.
 A group led by the then-President Roberto Freire called its 10th Congress despite a Congressional resolution which had been passed a year earlier that the party would not call a congress for that year and that determined that the party would be kept. Nevertheless, Freire managed to organize it and allow people who were not members of the party to vote.  That congress voted to dissolve the PCB and refound it as the democratic socialist Socialist People's Party (Partido Popular Socialista – PPS), in a way similar to what had transpired in Italy.
 However a small group, led by Ivan Pinheiro, questioning the legality of the 10th Congress, decided to keep the party Marxist–Leninist.
 After the dissolution of the PCB, decided by the 10th Congress, the Central Committee minority that was opposed to this action organized an "Extraordinary Reorganization Conference", where it decided to rebuild the party with the maintaining of its identity and by reviewing the path that it had followed in the precedent years. The party then started a battle in order to gain the rights to use the name Brazilian Communist Party and the acronym PCB (which was contested by the members of the PPS) and to legalize the party. In 1996, the PCB would be officially registered.
 The Party has realized four congresses since then: the 10th (1993), 11th (1996), 12th (2000) and the 13th (2006). It remains small, in spite of some recent growth during the government of Luiz Inácio Lula da Silva and the crisis of PT (it should be noticed that the main result of this process was the Socialism and Liberty Party). Although competing in elections and participating in wider electoral fronts, its electoral results were insignificant.
 In 2006, the PCB agreed on a nationwide alliance with two other left-wing parties, PSOL and PSTU. Putting aside some significant ideological differences, the three parties built a common agenda to try to break the polarity between presidential candidates Luiz Inácio Lula da Silva (PT) and Geraldo Alckmin (PSDB). The coalition also extended to gubernatorial and parliament elections to take place at the same time all over the country.
The PCB elected a state deputy (Jorge Souza, in the state of Amapá) and has about 20 local representatives.
 The party's union branch currently builds the central Intersindical and is growing greatly in the union movement. The student movement is responsibility of the Young Communist Union, which is also growing in size.
 The last party's Congress, the 13th, in 2005, voted to abolish the post of "president" and use only the traditional position of "General Secretary".
 In June 21st the page 'Em Defesa do Comunismo' published a video of  ex-general secretary of the Communist Party of Brazil, Ivan Pinheiro, questioning the actions of the current Central Committee of PCB (CC) and announcing that he would send a preliminary letter calling for an extraordinary congress  . A week later Pinheiro was expelled from the CC and from the PCB itself.  PCB's Candidate for the Pernambuco governorship in the 2022 elections, Jones Manoel, was also expelled from the CC and later from PCB after denouncing that 'a faction in the party was doing mass expulsions not tolerating criticism' 
 In early August, multiple local party cells and collectives, Regional Party Comittees, expelled members, and part of the UJC, created the PCB-Revolutionary Reconstruction (PCB-RR), calling for a democratization of the internal structure of the PCB, the restitution of arbitrarily expulsed members to their previous positions, and the XVII Party Congress (Extraordinary).  
 The Union of Communist Youth (UJC) publicly denounced in the 12th of August multiple arbitrary expulsions by the Central Committee (CC) that had occurred the day before against some of its elected members of the 2022 National Youth Congress, who were critical to other arbitrary disciplinary processes in the party, not recognizing those expulsions and officially calling for the XVII Party Congress
 In the night of October 31st,the CC organized a denounce against all PCB pages in support of PCB-RR and the XVII Congress, with the exception of the UJC, being able to take down most of the pages, and creating new, anti RR, pages, incluiding a new page for a pro-CC UJC. By November most pages of PCB-RR were recreated and Reorganized. 
 *PCB supported Juscelino Kubitschek (PSD) informally in 1955, due to its illegality
 **PCB supported Henrique Teixeira Lott (PSD) informally in 1960, due to its illegality
 * The 1947 elections had just a complementary character at the federal level (since the deputies elected in 1945 had mandates until 1950) and elected the State Chambers according to the new Constitution. The PCB elected 46 state deputies and become a major party in the Federal District (at this time, the city of Rio de Janeiro).
** The party didn't launch any candidates to the Senate, choosing to support other parties' candidates, following the party tactics of a "democratic front".