[2] As a socialist party, it is connected to homeless workers' movements and defends the nationalization of the banking system, social control of all monopolies, capitalist consortia, and the means of production at-large, as well as rural land reform and collectivization.

[4] In the 2018 Brazilian general election, Popular Unity supported the Socialism and Liberty Party presidential bid of Guilherme Boulos and Sônia Guajajara.

[11][12] The party's statute was published in the Diário Oficial da União on 3 September 2014, signed by its president, Leonardo Péricles Vieira Roque, coordinator of the Movement of Struggle in Bairros, Vilas and Favelas (MLB).

[13] Since 2014, the party's popularity has progressively increased among students and organized labor, acquiring national expression from its opposition to the government of Michel Temer,[14] and then to Jair Bolsonaro in the 2018 Brazilian presidential election.

[34] In São Paulo the Popular Unity joined the PSOL coalition supporting the candidacy of Guilherme Boulos with the vice candidate Luiza Erundina.

[35] In Belo Horizonte, the party's national president, Leonardo Péricles, was a candidate for vice-mayor in the slate of federal deputy Áurea Carolina (PSOL).

In Florianópolis, the party was part of the Popular Front, together with PSOL, PT, PDT, PCdoB, PSB and REDE, as well as the organizations PCLCP and UCB.

[41] The party is linked to movements that work in defense of subsidized housing and defends the nationalization of the banking system, social control of all capitalist monopolies and consortia and of the means of production in the strategic sectors of the economy, and agrarian reform.