This question already has an answer here:
Checking my recent activity, I noticed that [nearly] all of my posts were downvoted within a short span of a few minutes. It seems as though I've been the victim of a systematic downvoting spree.
What can I do if I suspect that someone has downvoted all my posts in retaliation or revenge? Is there something in place that will stop this kind of voting abuse? Do I have any possible avenues of recourse?