Managing membership in your organization
After you create your organization, you can add people as members of the organization. You can also remove members of the organization, and reinstate former members.
Adding people to your organization→
You can make anyone a member of your organization using their GitHub Enterprise Server username or email address.
Removing a member from your organization→
If members of your organization no longer require access to any repositories owned by the organization, you can remove them from the organization.
Reinstating a former member of your organization→
Organization owners can add former members to your organization, and choose whether to restore the person's former role, access permissions, forks, and settings.