The National Confederation of Trade Unions of Greenland (Greenlandic: Sulinermik Inuussutissarsiuteqartut Kattuffiat or simply SIK) is a trade union centre in Greenland.
It was formed in 1956 as 'GAS, Grønlands Arbejder Sammenslutning" until 1978 and has a membership more than 10,000, approximately 40% of the Greenlandic workforce.
SIK is affiliated with the Council of Nordic Trade Unions.
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