++++ 1 . EEC - COMMUNITY LEGAL SYSTEM - SPECIAL NATURE - STATUS IN RELATION TO NATIONAL LEGAL SYSTEMS - SUPREMACY OF RULES OF COMMUNITY LAW 2 . POLICY OF THE EEC - COMPETITION RULES - CARTELS - PARALLEL ACTION BY COMMUNITY AND NATIONAL AUTHORITIES - PERMISSIBLE SUBJECT TO OBSERVANCE OF COMMUNITY LAW - REQUIREMENT OF NATURAL JUSTICE IN THE EVENT OF CONCURRENT APPLICATION OF COMMUNITY AND NATIONAL SANCTIONS ( EEC TREATY, ARTICLE 85(1 ); ARTICLE 87(2 )) 3 . EEC TREATY - PRINCIPLES - DISCRIMINATION ON GROUNDS OF NATIONALITY - PROHIBITION - DISPARITY OF TREATMENT RESULTING FROM DIFFERENCES BETWEEN NATIONAL LEGISLATIVE SYSTEMS NOT REFERRED TO ( EEC TREATY, ARTICLE 7 )