"In certain circumstances the two rights may come into conflict and it may be considered necessary, in the period preceding or during an election, to place certain restrictions, of a type which would not usually be acceptable, on freedom of expression, in order to secure the “free expression of the opinion of the people in the choice of the legislature”. The Court recognises that, in striking the balance between these two rights, the Contracting States have a margin of appreciation, as they do generally with regard to the organisation of their electoral systems (see Bowman, § 43, cited above). "
CoE (ECHR): Case of Oran v. Turkey, para. 52

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Case of Oran v. Turkey