Germany - 2004 Party Law

Title Article 3 Active and Passive Legitimization
Section I General Provisions
Article

3

A political party may institute legal proceedings in its own name and lawsuits may be brought against it. The same shall apply to its top regional branches, unless specified otherwise in the party statutes.

Categories - Extra-parliamentary party (Registration reqs.)
Source http://www.bundeswahlleiter.de/en/parteien/downloads/parteiengesetz_engl.pdf