grievance (
http://definr.com/grievance)
n 1: a resentment strong enough to justify retaliation; "holding
a grudge"; "settling a score" [syn:
grudge,
score]
2: an allegation that something imposes an illegal obligation
or denies some legal right or causes injustice
3: a complaint about a (real or imaginary) wrong that causes
resentment and is grounds for action