If you want to go down a rabbit hole you should read about the recent Italian trial of ~300 mobsters. IIRC they have something like 800 witnesses scheduled to appear and they had to build a special courtroom to hold everyone. One of the accused was in hiding and police only located him after finding his cooking channel on YouTube.

Unfortunately English-language reporting is pretty light on the details presented in court but here are two articles to get you started.

About the trial: https://www.bbc.com/news/world-europe-55633091

About the prosecutor: https://www.independent.co.uk/independentpremium/mafia-trial...