The
Partido Democrática Republica de Timor (PDRT),
Partido Milénio Democrático (PMD),
Partido Republika Nacional Timor Leste (PARENTIL),
Partidu Liberta Povu Aileba (PLPA), and the
Partido Socialista de Timor (PST) resolved to form the alliance at a national convention on 1 July 2015. It was officially registered with the
East Timor Supreme Court of Justice in
Dili on 13 July. On 29 July, it was officially presented to the public at the
Hotel Timor. On 18 September, the headquarters at
Bidau (Dili) was opened. All member parties of the alliance failed to meet the three-percent hurdle at the
2012 parliamentary elections. The aim of the alliance was to work together at future elections. The BUP member parties received in total 3.48% of the valid votes (18,516 votes). For that election, PARENTIL and PMD were already in a coalition as the
Coligação Bloco Proclamador, as were the PDRT and PLPA as the
Coligação PLPA/PDRT. On 27 July 2016, the PST left the alliance. As the electoral register was being drawn up at the Supreme Court at the beginning of June 2017, PARENTIL also withdrew, leaving only the PDRT, PMD, and PLPA in the BUP. PARENTIL did not participate in the
2017 parliamentary election, while the PST stood by itself. Disagreements were cited in the press release as the reason for both parties leaving. The BUP received 0.88% of the vote in 2017, failing to meet the four-percent hurdle. == Members, programme, and structure ==