Question re: Mass disposition of candidates

Summary

Mass disposition candidates

Content

Hi everyone! Trying to do some data cleanup in our Taleo instance. Unfortunately, many of our reqs were closed without the Recruiters dispositioning all candidates. Does anyone know a way to do mass dispositioning to a rejected status on any candidate attached to a closed/filled req? I don't want to have to go through every req individually for the past 6+ years. 
Thanks!

Debbie