Cliques often ostracize or exclude other employees.
One way to prevent employees from ostracizing others is to assign them to group projects instead of allowing them to choose their own groups.
When you allow employees to pick their own groups, you are opening the door to workplace bullying. Conversely, when you select the group, you are ensuring that they include those outside their circle of friends. Pre-selected groups also give employees an opportunity to learn how to work with different types of people.
Another way that workplace cliques can affect employee morale is by making a big deal out of the things they do together. For instance, cliques often laugh and share inside jokes that other employees do not get. These secrets create an unbalanced workforce because some employees are left feeling like outsiders instead of part of the team.