The Social Liberal Party was a far-right political party in Brazil, that merged with the Democrats and founded the Brazil Union. Founded in 1994 as a social-liberal political party, the PSL was registered on the Superior Electoral Court in 1998.

The Democrats was a centre-right political party in Brazil that merged with the Social Liberal Party to found the Brazil Union in 2021. It was founded in 1985 under the name of Liberal Front Party from a dissidence of the defunct Democratic Social Party (PDS), successor to the National Renewal Alliance (ARENA), the official party during the military dictatorship of 1964–1985. It changed to its current name in 2007. The original name reflected the party's support of free market policies, rather than the identification with international liberal parties. Instead, the party affiliated itself to the international federations of Christian-democratic (CDI) and conservative parties (IDU). The Democrats' identification number is 25 and its colors are green, blue, and white.