I agree but would advise doing so anonymously as thanks to Harriet Harridan a punter who has punted with such a coerced WG could get done himself whether he knew she was being coerced or not.
There are supposed to be systems in place for reporting things like this.
Whilst on the subject, do not phone crimestoppers or any such number from any landline or mobile that can be traced back to you. The first thing they do is exactly that.
Best to phone from a phonebox that is not in view of any CCTV.
Or better still, post a plain typed note.