The Norwegian Confederation of Trade Unions (Norwegian: Landsorganisasjonen i Norge, LO) is a national trade union center, decidedly the largest and probably the most influential umbrella organization of labour unions in Norway. The 21 national unions affiliated to the LO have almost 900,000 members of a Norwegian population of 5 million. The majority of affiliated unions organizes traditional blue collar workers, but the largest affiliate is the Norwegian Union of Municipal and General Employees which makes up more than a third of all members. LO is affiliated to the ITUC and the ETUC. Gerd Kristiansen was elected leader on 6 May 2013 for a four-year period.