A short pull-down list would work well: Spam, Harassment, Site ToS Violation, Thread/Group Rules Violation, etc.
This way you can automate rules like: if an article get's N spam or harassment reports it's put into the review queue and hidden until a Moderator can review it.
Well, after the first four they were handed off to someone else to write: https://en.wikipedia.org/wiki/Frank_Herbert#Posthumously_published_works