Its initial affiliates were eight small, independent unions.
In 2009, the Malta Union of Teachers joined FOR.U.M., increasing at the time its total affiliated membership to 11,000.
It affiliated to the European Trade Union Confederation in 2011.
has 14 Union affiliates with a total membership of 13,000 workers from different professions and spheres.
are AAE, ALPA, EPOU, ESSU, MUMN, MUT, UCC, UHBC, UMASA, UPAP, UPISP, and UTAC.