The article examines one of the episodes in the history of the Finnish Communist Party (FCP). In 1919, O. W. Kuusinen and J. Luomivuokko were sent to Finland to organize there an underground network of communists. They found that the circumstances of the political life had changed significantly since the time the Reds’ leaders had left Finland. Therefore, O. W. Kuusinen and his colleges suggested a fundamentally new approach to the tactics of the Finnish Communist Party. A combination of legal and illegal methods was proposed as the main political line of FCP. Finnish communist colleagues in Moscow did not accept these ideas because they saw them as a comeback of the social.democratic tradition. The antagonisms between Finns in Moscow and Finnish communists who worked in Finland were very acute. A change in the political line of the Comintern and support from the government of Soviet Russia gave a new life to Kuusinen’s concept.