This paper aims to analyze the process that culminated in the founding of the Democratic Labour Party (PDT), as well as the program adopted by the party and its performance in the 1982 elections, with emphasis on the case of Rio de Janeiro. To this end, we will begin by discussing the general context of Brazilian politics, which at the time was undergoing a "top-down" transition led by the dictatorship. Our focus will be on the amnesty and party reform that, among other things, paved the way for new parties to be organized in Brazil. Following this, we will follow the party project led by Leonel Brizola, who, from 1977 onwards, while still in exile, began to work towards the founding of a new Brazilian Labour Party (PTB). We will see that important support was obtained abroad, such as from exiled Brazilians and organizations gathered in the Socialist International (SI). Finally, we will address the work done on Brazilian soil, demonstrating the activities carried out here in support of the PTB. One of the important points in this journey is the legal dispute with former congresswoman Ivete Vargas over the PTB (Brazilian Labour Party) acronym. At that time, the Brizola supporters ended up losing, consequently having to found a new party, named the Democratic Labour Party (PDT). Later, we will analyze the programmatic proposals presented by the PDT, summarized in the term "moreno socialism," coined by Darcy Ribeiro. Furthermore, we will evaluate the performance of the PDT in the 1982 elections, which constituted the party's first electoral challenge. Taking the state of Rio as the focus of analysis, we will see that the PDT obtained a significant vote, winning the state government and becoming the largest political force in the local Legislative Assembly (Alerj).