Whakamahia te rerenga e whai ake nei: I whakatau a Kosonen ki te hoki ki Finland i te tau 1905. I uru ia ki nga mahi a te Social Democratic Party, a i mahi ia hei etita mo te niupepa "Kansan Lehti". I te wa o te 1905 Russian revolution, i whakahaerehia e Kosonen he whare noho mo nga rerenga mai i te rohe Baltic o te Emepaea o Ruhia, i awhina ano hoki ki te whakarite i te
Hakihea 1905 Te hui Bolshevik o Tampere. I te Hui-tanguru 1906, i awhina ia i te kaiwhakangungu Latvian a Jānis Čoke, i kitea i muri mai i te tahae o te peka o te Peeke a Ruhia i Helsinki.