Withheld information limits power of action. A monopoly of information can give a form of security. There is, in all organizations at all levels, selective withholding and extending of information. Sole possession of information can make others dependent on a single individual or unit. Withholding of information can limit the scope and power of others' actions and reduce the threat to such units. Control of information channels can isolate certain persons from the remainder of the organization and keep them within a controlled sphere of influence.