Revolutionary Socialist Party (Portugal)

Revolutionary Socialist Party Partido Socialista Revolucionário
Leader	Francisco Louçã
Founded	1978 (1978)
Dissolved	1999 (1999) (as party) 2013 (2013) (as association)
Merger of	Internationalist Communist League Workers Revolutionary Party
Succeeded by	Left Bloc
Headquarters	Rua da Palma, 268 110-394 Lisbon
Newspaper	Combate Operário Revista Combate
Ideology	Trotskyism Socialist feminism
Political position	Left-wing
International affiliation	Fourth International
Colours	Maroon
Party flag
Politics of Portugal Political parties Elections

The Revolutionary Socialist Party (Portuguese: Partido Socialista Revolucionário, pronounced [pɐɾˈtiðu susiɐˈliʃtɐ ʁɨvulusiuˈnaɾiu], or PSR) was a left-wing party in Portugal, founded in 1978 after the merger of two Trotskyist parties: the Internationalist Communist League (Portuguese: Liga Comunista Internacionalista LCI) and the Workers Revolutionary Party (Portuguese: Partido Revolucionário dos Trabalhadores, PRT).^[1] The LCI and PRT were both part of the reunified Fourth International. The International recognised the PSR as its Portuguese section.

In 1998 Party renamed itself in order to join with some other left-wing parties in founding the Left Bloc (Bloco de Esquerda or BE). The organisation retained the acronym (PSR) and became a civil society organisation under the name Revolutionary Socialist Political Association (Associação Política Socialista Revolucionária (APSR)). The original party, a member of the Fourth International, was however officially dissolved in 2008.^[2]

The historical leader of the PSR is Francisco Louçã,^[3] who would become leader of the Left Bloc.

The party had never achieved parliamentary representation before the merger in the Left Bloc, although it may be considered the 3rd or 4th biggest left-wing party in the country.