EN
Starting from legal regulation of parallel proceedings in Regulation 1/2003 on the implementation of the rules on competition laid down in Articles 81 and 82 of the Treaty the article gives survey of community judicature concerning conditions of application of the ne bis in idem principle in competition cases. It demonstrates reflection of their conclusions as far as the ne bis in idem principle is concerned on recently judicator international cartel agreement (GIS) in judicature of the national competition authorities of the Slovak and Czech Republic.