The paper introduces new data on interactions between political parties and interest groups in post-Communist countries from Central and Eastern Europe: Lithuania, Poland and Slovenia. The data comes from Comparative Interest Group Survey (http://cigsurvey.eu/). While political parties have kept scholarly attention, research on interest groups has also gained popularity. However, with few notable examples, we lack a systematic analysis on interactions between these two actors. The gap is even more puzzling as interest groups and political parties established links of interaction already in the nineteenth century. From this point, it is interesting how these processes have endured in the post-Communist CEE, as almost everything we know on interactions between political parties and interest groups comes from the research on West European countries and the United States. To fill this gap, we analyse the structural factors behind the interactions between those two actors in Lithuania, Poland and Slovenia. We argue that radical and different - than in Western post-industrial democracies - departure points for civil society and political system are the most salient factors behind the parties-groups relations.
