Post-communist states in Central and Eastern Europe inherited a large union’s membership. After 1989 many of these non-state actors lost their influence over state actors or institutions. In this general context, the paper looks at the capacity of current non-state actors in this area (Poland, Czech, Ukraine and Russia) to influence state decisions. These are not lobby activities because they are unstructured and cannot be define as such, but the strategies used are pretty much alike. There are two identifyable instruments: cooperation and pressure; which lead to different types of relations: tripartite (formal agreement) and social networks (informal agreements).