A small series of changes occurred in club organization following the assassination attempt on the Tsar during the Sveta Nedelya bombing in 1925. A much wider-reaching wave of changes occurred ten years later, following the coup d'état by the Zveno organization in 1934, and the subsequent counter-coup by Tsar Boris a few months later, in 1935. Following this series of political upheavals, many small Sofia clubs were merged into larger ones, or else they underwent temporary or permanent name changes, depending on the political affiliations of their members.