The Union of Belgian Metalworkers (Dutch: Centrale der Metaalindustrie van België, CMB; French: Centrale de l´Industrie du Métal de Belgique is a trade union representing workers in metal and related trades in Belgium.
It operated as a loose federation, and various affiliates joined and left over the first few years, but with a general upward trend.
However, it gradually rebuilt, launching a monthly magazine in 1899, and establishing pension and welfare funds for members.
This was largely resolved by the late 1960s, and membership reached a record high of 216,490 in 1976, but the union then struggled against job losses in the industry.
[1][2] In 2006, the union gave its Flemish and Walloon regions high levels of autonomy, with only a small federal structure uniting the two.