You do. Tthinkbeta.com's It’s Up to You: Trademark Infringement not Uncle’s Watch hits on something that I never seem to explain well:
"So the bottom line, YOU have to police copyright, trademark, patent etc. infringement. Uncle has not, and will not, do it for you. Hank"
You go to court, the court does not come to you. That means hiring lawyers. Who file papers with the court.
This rule applies from starting a lawsuit to collecting a judgment: you have to do it, no one does it for you (not courts, not prosecutors, not other government agencies).