The Social Democratic Party was founded in January 1913 at a so-called "Basis of Unity" Conference (often simply called the "Unity Conference"). This meeting drew together the most prominent left-wing groups in New Zealand, including both political parties and trade unions. The aim was to unite the fractious labour movement into a cohesive force. At the end of the Conference, most of the attendees agreed to merge into two new organisations – the new United Federation of Labour would co-ordinate the trade unions, while the two main political parties (the hard-line Socialist Party and the moderate United Labour Party) would merge to form the Social Democrats. Not all members of the United Labour Party accepted the plan, however, and some continued on under the same banner and continued as a Rump party.