“…Several studies indicate the spread of communist attitudes and support, both within and between socio-political contexts, as early as the 1920s [6,39,26]. Furthermore, studies have been published on inter-party cooperation in Scandinavia [2,36], policy coordination between Christian democratic parties [35], the developmental cooperation in the postcommunist world upon its transition away from Communism [77], the competition between right-wing parties for issue ownership of Euroscepticism [65], the cooperation between social democratic parties [42], trans-national cooperation between European green parties [18], general cooperation in the European Parliament [4,41,72], the transnational cooperation between extreme right parties and movements in Eastern Europe [45], and even the cooperation between post-communist and nationalist parties in Eastern Europe [33]. Most recently, scholars come to assume that FRPs play an important (causal) role in the right turn of European politics [54].…”