It grew very slowly until World War II, but this changed after it joined the Swedish Trade Union Confederation in 1939.

In 1952, the cinema section of the Swedish Municipal Workers' Union joined in, followed in 1965 by the Association of Swedish Chamber Musicians and the Association of Musical Artists.

Finally, in 1971, the Association of Patrolmen joined, while in 1984 the Swedish Union of Professional Musicians split away.

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