The Swedish Social Democratic Party , ( Swedish : Sveriges socialdemokratiska arbetareparti , SAP ; literally , `` Social Democratic Workers ' Party of Sweden '' ) , contesting elections as the Arbetarepartiet-Socialdemokraterna ( ` Workers ' Party - Social Democrats ' ) , usually referred to just as the ` Social Democrats ' ( Socialdemokraterna ) ; is the oldest and largest political party in Sweden , founded in 1889 .
The Swedish Social Democratic Party ( Swedish : Sveriges socialdemokratiska arbetareparti ) was established in 1889 , and is Sweden 's biggest political party .