High Quality Content by WIKIPEDIA articles! The Social Democratic Bund was a short-lived Jewish political party in Soviet Russia. It was formed as the Russian Bund was split at its conference in Gomel in April 1920. The Social Democratic Bund was formed out of the rightwing minority section of the erstwhile Russian Bund (the leftwing majority formed the Communist Bund). The party was led by Raphael Abramovitch.