Deleting Security Groups
If you are an administrator and you have the necessary authorization, you can delete security groups that are not currently being used.
Click the Setup tab then click the Security Groups link to view a list of existing security groups..
On the Security Groups page, select the check box in the left column next to each security group you want to delete.
Note: You cannot delete a security group if one or more employees are assigned to it. To delete a security group, you must first remove all employees from that security group.
Click the Delete button.
In the confirmation dialog box, click the OK button.