The right to freedom of association applies also to associations themselves, implying that those within the association have the right to choose with whom to associate. The African Commission corroborates this principle in its Draft Guidelines on Freedom of Association and Assembly in Africa, explaining that
Similarly, the ECtHR has held that the right to freedom of association entails the right for a private association to choose its own members:
At times a balance needs to be struck between the rights of the collective and the rights of the individual. In Arenz et al v Germany, the UN Human Rights Committee ruled in favor of the freedom of a political party not to associate with Scientologists over the rights of the latter’s desire to associate with them. The applicants in the case were Scientologists who were expelled from one of Germany’s major political parties, the Christian Democratic Union (CDU) on the basis of their religion. The expulsions arose after the CDU adopted a resolution, which determined that Scientology was incompatible with CDU membership. The authors challenged their expulsions in court without success. The German courts had found that the CDU’s decision was not arbitrary, and that they would not interfere with the political party’s autonomy over its membership. The Human Rights Committee ultimately took the position that it could not interfere with the German courts’ findings regarding the balance of interests between the authors and the members of the party.
The OSCE/ODIHR and Venice Commission Joint Guidelines on Freedom of Association stipulate that associations shall be free to determine their rules for membership, subject only to the principle of non-discrimination.