It was founded in 1989 by dissidents of the Brazilian Labour Party and is a minor force in Brazilian politics.
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:Not to be confused with the Brazilian Labour Party or the Workers' Party.
After the victory of former President Jânio Quadros (Brazilian Labour Party-PTB) over Fernando Henrique Cardoso in November of that year, Orestes Quércia saw his popularity in the party increase with the movement called "quercismo" which guaranteed its nomination as candidate for governor despite internal dissidence.
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Getúlio Vargas, nominated by the PSD and his Brazilian Labour Party (PTB) in various states including Rio Grande do Sul was elected to the Senate representing Rio Grande do Sul and São Paulo as well as elected to the Chamber in six states and Rio de Janeiro.
Up to 1965, there were three main parties in Brazil: the left-wing populist Brazilian Labour Party (PTB), the liberal Social Democratic Party (PSD) and the conservative National Democratic Union (UDN).
Two of them were pro-Vargas — the Brazilian Labour Party (Partido Trabalhista Brasileiro, PTB) to the left and the Social Democratic Party (Partido social Democrático, PSD) in the center — and another anti-Vargas, the rightist National Democratic Union (União Democrática Nacional, UDN).