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As a movement for social reform SAK also influences political policymaking and public opinion.

SAK is a confederation of 18 trade unions in industry, the public sector, transport, private services and culture. These unions have a total of over 800,000 members, and promoting the emotional and material welfare of these individuals is the prime concern of SAK. SAK is the largest labour market organisation in Finland.

Membership numbers of SAK-affiliated trade unions of 1 January, 2022