66Concerning measures of public policy, it is clear from Article 3 of Directive 64/221 that, in order to be justified, they must be based exclusively on the personal conduct of the individual concerned. It is stated in the same provision that previous criminal convictions cannot in themselves justify those measures. As the Court has held, particularly in Case 30/77 Bouchereau [1977] ECR 1999, paragraph 35, the concept of public policy presupposes the existence, in addition to the perturbation of the social order which any infringement of the law involves, of a genuine and sufficiently serious threat to the requirements of public policy affecting one of the fundamental interests of society.
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