"The exceptions set out in Article 11 are to be construed strictly; only convincing and compelling reasons can justify restrictions on freedom of association. In determining whether a necessity within the meaning of Article 11 § 2 exists, the States have only a limited margin of appreciation, which goes hand in hand with rigorous European supervision embracing both the law and the decisions applying it, including those given by independent courts (see, for example, Sidiropoulos and Others, cited above, § 40). That is especially so in relation to political parties in view of their essential role in “a democratic society” (see, for example, United Communist Party of Turkey and Others, cited above §§ 25, 43 and 46). "
CoE (ECHR): Case of Herri Batasuna and Batasuna v. Spain, para. 77

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Case of Herri Batasuna and Batasuna v. Spain