The Gibraltar Socialist Labour Party (GSLP) is a social-democratic political party in Gibraltar. The GSLP is the oldest surviving active political party in Gibraltar. Its roots are based in the trade union movement, as its founder and former leader Joe Bossano was the District Officer of the Transport and General Workers Union (TGWU). The party has been led since 2011 by Fabian Picardo, who as served as Chief Minister of Gibraltar since the 2011 general election. The GSLP forms the GSLP–Liberal Alliance in partnership with the Liberal Party of Gibraltar.