If you are the project-owning project administrator you can restrict individual organization's access to project data.
Setting an organization to archive access effectively removes them from participation on the project.
Archived organisation’s cannot receive mail or updated documents, are not visible in the project directory and cannot be re-invited to the project (unless you or another project admin reinstates a normal access level for them).
Changing an organization’s access level does not prevent users from seeing their own data or anything which has already been sent to them