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Democratic Left Alliance-Labour Union (Polish: Sojusz Lewicy Demokratycznej-Unia Pracy, SLD-UP) is an electoral committee and a coalition of two Polish centre-left political parties: Democratic Left Alliance and Labour Union. At the national level, the alliance arose at the time of the 2001 parliamentary elections and continued through the 2004 elections to the European Parliament. The alliance came together again for the 2009 European parliamentary elections.
The SLD-UP won a stunning victory at the 2001 parliamentary elections, gaining 41% of the vote, and formed government with the Polish People's Party. During the 2001-2005 term, there occurred a splintering of the alliance and there came into being 4 left-wing political caucuses in Polish Parliament:
The SLD-UP maintained their alliance for the European parliamentary elections of 2004, and won 5 seats with 9.3% of the vote, a sharp decline from the national elections in 2001.
In the 2005 parliamentary elections SDPL, Labour Union and Greens 2004 formed a joint electoral committee, under the leadership of the SDPL, and most of the PLD members joined Self-Defense of the Republic of Poland.
Following the relatively poor performance of the SDPL-UP-Greens at the 2005 parliamentary elections (they polled 3.9% and failed to break the 5% parliamentary threshold), and the overwhelming success of right wing parties, the SDPL and UP sought to reapproach the SLD, and seek a new understanding. A new alliance was born in 2006-07, the Left and Democrats, which consisted of the three left wing parties, SLD, SDPL and UP as well as the centrist Democratic Party (PD). Left and Democrats contested the 2007 parliamentary elections and polled 13.2% of the vote. SLD, SDPL and PD saw several of their representatives elected to the Sejm, but the UP failed to elect any members. In 2008, following a rift between the constituent parties of the Left and Democrats, the alliance came to an end with PD and SDPL leaving the alliance in April. These two went on to form the Agreement for the Future, together with the Greens 2004, for the 2009 European elections. The Labour Union, however, chose to maintain its alliance with SLD, and at the elections SLD-UP polled 12.3%, electing 7 representatives to the European Parliament.