The Swaziland Federation of Labour (SFL) was created in 1994 as a break-away union from the Swaziland Federation of Trade Unions.
It has 12 affiliates covering manufacturing, retail, finance, IT, media and non-teaching staff, amongst other things.
Originally 5,000 strong, the membership of the organisation has increased to 20,000.
The federation has no full-time officials and relies on the full-time officers in its affiliated unions.
The SFL also operates from affiliated unions' offices and has little finance of its own.