grievance|grievances

他对公司的不公平待遇一直心怀不满。

He has held a ___grievance against the company for its unfair treatment.

工人们向管理层提出了他们对不公平待遇的不满。

The workers presented their ___grievances about unfair treatment to the management.

工人们向管理层提出申诉，抱怨工作时间安排不公。

The workers submitted a ___grievance to management about unfair work schedules.