Since 1904 it has been the Finnish arm of the International Alliance of Women.
The co-founders were Lucina Hagman, Maikki Friberg and Venny Soldan-Brofeldt.
Unioni was initially concerned with women's voting rights (granted in 1906), equal pay, education and combatting prostitution.
[2] Today the association exerts influence on political discussions, seeks to improve women's rights and works against oppression.
[3] Compared to similar organizations in other countries, membership, at under 2,000 was rather low.