"[Political parties] are thus a specific kind of association, which in many countries is submitted to registration for participation in elections or for public financing. This requirement of registration has been accepted, considering it as not per se contrary to the freedom of association, provided that conditions for registration are not too burdensome. And requirements for registration are very different from one country to another: they may include, for instance, organisational conditions, requirement for minimum political activity, of standing for elections, of reaching a certain threshold of votes... However, some pre-conditions for registration of political parties existing in several Council of Europe Member States requiring a certain territorial representation and a minimal number of members for their registration could be problematic in the light of the principle of free association in political parties."
CoE (Venice Commission): Report on the Participation of Political Parties in Elections, para.15

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Report on the Participation of Political Parties in Elections