Who is afraid of actio popularis? If, as the German experience suggests, the actio popularis exclusion serves to bar individuals from invoking objective illegality that does not concern rights, while standing of associations is a way to enforce objective legality despite the actio popularis exclusion, it is hard to see why this should have any relevance for the European Convention of Human Rights. Human rights are, after all, rights.
https://verfassungsblog.de/who....-is-afraid-of-actio-