Key legal question
Whether the appellants were entitled to file a federal criminal nullity appeal as private prosecutors.
Extracted holding
Yes. They had conducted the prosecution alone under Zurich procedural law and were therefore entitled to appeal under Art. 270 lit. g BStP.
Extracted reasoning
The court held that private-prosecutor standing exists where cantonal law leaves prosecution entirely to the injured party without participation of the public prosecutor; that was the case in Zurich defamation proceedings.