Dnieper Ukraine
At the end of 1904 he headed the left wing of the UDP, which formed the Ukrainian Radical Party, and at the end of 1905 it merged with the UDP into the Ukrainian Democratic Radical Party. From 1906 he was an employee of the newspaper Hromadska Dumka and editor of the magazine Nova Hromada. In 1906-1909 he headed the Kyiv Prosvita. Grinchenko belonged to the group of the most prominent representatives of Ukrainian populism. During the period of the greatest scale of the great-power chauvinist policy of the Russian government in Ukraine, he advocated the consistent conduct of national and cultural work among Ukrainian society. He expressed his political views in his program of the UDRP and in "Letters from Dnieper Ukraine" (Bukovyna newspaper, 1892-1893).