Grievance (noun)

1. A complaint or resentment, especially one made by an employee against an employer.
2. A sense of injustice or a feeling of being wronged.

Origin:

From middle english greevance, from old french grevance, from grever ("to burden, oppress"), from latin gravare ("to weigh down"), from gravis ("heav.y")

Examples:

1. The workers have a grievance against the company for not giving them a raise.
2. He filed a grievance with the union over the way he was treated by his manager.
3. The employee had a grievance regarding discrimination at the workplace.
4. The citizens had a grievance against the government for not providing proper services.
5. The patient had a grievance about the long waiting time at the hospital.