Is it possible the user to see the problem only members of the group? A user "developer" has seen the problem of all groups.
As part of the project are connected by different organizations. There is a need that they are not seen by the task each other. Since each organization is a separate group, it is necessary that users see only the tasks of their group. Тow there is only:
issues_visibility_all
issues_visibility_own
issues_visibility_public