Rubuta ci gaba ga wannan sakin layi - A lokacin yakin ci gaba
Koskinen yayi aiki a matsayin manzo kuma ɗan leƙen asiri ga Jam'iyyar Kwaminis ta Finland. Koskinen yana cikin hulɗa kai tsaye da Yrjö Leino. Ta kuma yi aiki a matsayin mataimaki ga 'yan gudun hijira da masu kutse.