In the 1920s the communists took part in the Socialist Workers' Party of Finland (1920–1923) and the Socialist Electoral Organisation of Workers and Smallholders (1924–1930).
Nos anos 20 os comunistas participaron no Partido Socialista dos Traballadores de Finlandia (1920-1923) e na Organización Electoral Socialista dos Traballadores e os pequenos propietarios (1924-1930).