The rules for all types of class actions in the Civil Proceedings Act state that only associations, bodies, institutions, or other organisations can bring class actions. These bodies must meet the following conditions:
- they must be founded in accordance with the law;
- their registered or statutory activity must be the protection of statutory collective interests and rights of citizens;
- they must be expressly authorised to bring such class actions by law; and
- they can only bring the actions under the conditions provided by the law that authorised them to file the class action.
Specific laws give more detail on who is authorised to bring a class action (point (iii) above). These include merchant chambers, interest associations of merchants, associations authorised for collective achievement of copyright rights, consumer associations, state bodies competent in the protection of consumers, government-authorised bodies, etc.
To be more specific, the POTROŠAČ association is authorised to bring class actions for the protection of consumer rights; the Croatian Composers’ Society is authorised to bring class action for the collective achievement of copyright rights; and the association KONTRA is authorised to bring class actions for the suppression of discrimination, etc.
Additionally, natural and legal persons, for whose collective interests the class actions were brought, can take part in the proceedings as interveners.