The Swedish Social Democrats came in the 1910s to split into two branches, one of which accounted for more parliamentary politics and the other for the revolutionary road. The revolutionary wing of the Swedish Social Democrats adopted the name of the Swedish Social Democratic Party and was later to form the Communist Party of Sweden - sectional of the Communist International. In my essay I have examined what the international movement has meant and how it has affected the social democratic Left in its decision-making and action in the 1910s. The investigation was primarily focused on the Swedish social democracy's view of the international movement, not least on the revolutionary wave that exceeded by Europe's Socialist and Communist supporters following the Russian Revolution erupted in 1917. I also review the development of the Swedish propaganda, which came to change with the connection to the international movement. By assuming Werner Schmidt's theory of the historical room, I have strived to create an understanding of the contemporary and the decisions that were taken. The decision to join the international communist movement, which later come to be so reviled. The results of the study have shown that the international movement was of paramount importance for the Socialist Left's existence. And that the perception of the revolution and the change of propaganda was completely in agreement with the prevailing ideological ideas.