The Swedish Building Workers' Union (Swedish: Svenska Byggnadsarbetareförbundet, Byggnads) is a trade union representing workers in the construction industry in Sweden. The union was established on 1 January 1949, when the Swedish Building Wood Workers' Union merged with the labourers' section of the Swedish Factory Workers' Union, the plumbers' section of the Swedish Metalworkers' Union and the construction workers' section of the Swedish Road Workers' Union. Like all its predecessors, the union affiliated to the Swedish Trade Union Confederation.
https://en.wikipedia.org/wiki/Swedish_Building_Workers%27_Union