145So far as concerns, in the first place, the argument alleging breach of the principle that penal provisions may not have retroactive effect, it should be pointed out first of all that it is clear from the Court’s case-law that the principle that penal provisions may not have retroactive effect constitutes a general principle of EU law (see, to that effect, judgments of 10 July 1984, Kirk, 63/83, EU:C:1984:255, paragraph 22, and of 8 February 2007, Groupe Danone v Commission, C‑3/06 P, EU:C:2007:88, paragraph 87). That general principle of law requires the infringement attributed to a person and the penalty imposed on that basis to correspond to those which were laid down at the time when the action or omission constituting the infringement occurred (see, to that effect, judgments of 10 July 1984, Kirk, 63/83, EU:C:1984:255, paragraph 21, and of 8 September 2015, Taricco and Others, C‑105/14, EU:C:2015:555, paragraph 56).
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