The Polish main socialdemocratic party, established on April 15th, 1999. Members of SLD were earlier mostly members of SdRP (Socjaldemokracja Rzeczypospolitej Polskiej - Socialdemocracy of the Republic of Poland).
SdRP and some other socialist and socialdemocratic partie formed a left wing coalition called Sojusz Lewicy Demokratycznej (1991-1999). In 1999 the coalition became a party, but lost some members.
SLD was established mostly by former members of PZPR (Polska Zjednoczona Partia Robotnicza - Polish United Workers Party), which ruled in Poland until 1989. PZPR was a communist party, but today's SLD is a pro-European social democracy party. A coalition between SLD and Polskie Stronnictwo Ludowe ruled Poland in the years 1993-1997.
The president of SLD is Leszek Miller, currently the Prime Minister of Poland. The former president of SLD, Aleksander Kwasniewski is currently the President of the Republic of Poland from December 1995.
SLD has 200 (of 460) members of the Sejm and over 70 senators (of 100). In 2001 election SLD formed a coalition with Unia Pracy (UP, Labour Union), and after the election, the coalition has been joined by Polskie Stronnictwo Ludowe (Polished Peasants' Party). This coalition formed the government.
Sojusz Lewicy Demokratycznej in the World Wide Web: http://www.sld.org.pl
The coalition between SLD and UP: http://www.sld-up.pl