Managing organizations in your enterprise
Organizations are great for creating distinct groups of users within your company, such as divisions or groups working on similar projects. Internal repositories that belong to an organization are accessible to users in other organizations, while private repositories are inaccessible to anyone but members of the organization that are granted access.
Configuring visibility for organization membership→
You can set visibility for new organization members across your enterprise to public or private. You can also prevent members from changing their visibility from the default.
Preventing users from creating organizations→
You can prevent users from creating organizations in your enterprise.