428In the present case, the fact that, in a number of decisions preceding the organic peroxides decision, the Commission did not hold liable for infringement of Article 81(1) EC undertakings which contributed to the implementation of a cartel but were not active on the market affected by the infringement could not give rise to a legitimate expectation on the part of Deltafina that it would refrain in future from pursuing and penalising such undertakings. As the Court has already held at paragraphs 163 to 165 in its judgment in AC-Treuhand v Commission, paragraph 48 above, the reorientation of the Commission’s decision-making practice in the organic peroxides decision is based on a correct interpretation of the full implications of the prohibition laid down in Article 81(1) EC.