CITUB (Confederation of Independent Trade Unions in Bulgaria) or KNSB was created February 17, 1990, during a major reorganization of the BTU - Bulgarian Union (Bulgarian Trade Unions).

Today, CITUB / KNSB trade union center is the largest in the country and occupies a prominent place in Bulgarian society today. Its headquarters is located in Sofia and has approximately 350,000 members. It includes approximately 7,000 organizations spread across 34 trade union federations and 29 regional coordinating councils.