Abstract
<jats:p>The article attempts to identify the causes that led to the split in the modern social democratic movement. In 2013, some parties and movements withdrew from the Socialist International, an international organization whose membership for several decades has served as one of the most important criteria for defining a party as a social democratic one. The split in the Socialist International and the formation of the Progressive Alliance, which was joined by a number of social democratic parties and movements, seriously shaken the international positions of this organization and did not contribute to strengthening the influence of the Social democratic camp as a whole. The article concludes that a combination of ideological, political, and organizational factors led to the split in the international social democratic movement.</jats:p>