The Union of Belgian Stoneworkers (Dutch: Centrale der Steenbewerkers van België; French: Centrale des Ouvriers de la Pierre de Belgique, COPB) was a trade union representing quarry workers in Belgium.
[1] The union undertook a lengthy strike in Écaussinnes in 1908, and this experience led it to restructure.
It became the more centralised "Union of Belgian Stoneworkers" on 1 January 1909, and by the end of the year, it had 6,435 members.
[2] After World War I, employment in the industry declined, as mechanisation increased, but initially the union's membership continued to grow, reaching a peak of 25,752 in 1921.
[2] The union's leader, Hubert Lapaille, was a leading figure in the Belgian Resistance during World War II.