This book discusses the procedural rights enjoyed by those being investigated under Articles 81 and 82 of the EC Treaty and of the Merger Control Regulation, and their right to challenge the Commission's decision in the Community Courts. It further assesses how their rights to 'due process' in competition proceedings before the European Commission comply with the notion of 'administrative fairness' enshrined in the European Convention on Human Rights, in accordance with the case law of the European Court of Human Rights.