Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Union of Democratic Forces (Bulgarian: , Suyuz na demokratichnite sili, , SDS) is a political party in Bulgaria, founded in December 1989, as a union of eleven political organizations in opposition to the Communist government. The following year, six more parties were incorporated, and in February 1997, the Union was transformed into a single unified party with the same name, by then-chairman and Prime Minister-to-be Ivan Kostov. The UDF is a member of the European People''s Party (EPP).