
The Green Party (Les Verts) challenged the political party funding from the European Parliament arguing that the system unlawfully favoured those parties already represented in the Parliament to the detriment of newer parties.

Thus, despite the European Parliament not appearing in the list of potential defendants laid down in Article 173 EEC Treaty, an action for annulment may lie against its measures intended to have legal effects vis-à-vis third parties.
With the ruling, the system by which the European political parties were financed was declared unlawful.
https://curia.europa.eu/juris/documents.jsf?num=294/83
