There are four main types of grievances. First, the individual grievance is filed when one member of the union feels mistreated. A group grievance occurs when several members of the union feel they have been mistreated and file a grievance as a group. A principal grievance may be filed on behalf of the union and is usually based on a larger issue, such as a policy or contract issue. A union or policy grievance may be filed if the employee does not wish to file the grievance individually.. True or FALSE