We can find communication in every single human act, therefore even "non-communicating" represents a form of communication. The basic for the developement of an internal organization is effective communication, which can also be a key factor for managerial behaviour and organization of the whole system. In order to organize themselves and to create certain values inside an organization people must create interaction, and for that they need to communicate between themselves.Good bussines communication works like a bloodstream of teh organization and assures healthy balance in their activities.The majority of misunderstanding in "bussines life" occures due to the lack of open communication between co-workers, for instance recieving information and giving a feedback, due to bad communication between co-workers. Encouraging and facilitating communication between co-workers is one of the basic assignments for a manager. Therefore successful managers take care of the way communication is transferring inside an organization and, in that way, they can have an effect on the workers moral, which will contribute to the success of an organization.Let's take Croatian Red Cross for the example of successful internal communication inside an organization. Successful internal communication is the main prerequisite for a successful flow of business activities which will carry out set of goals made by an organization. In this case, goals that are set for this organization are quickly and efficiently provide humanitarian aid. Bad communication inside this organization can lead to bad consequnces for people that are in need of an humanitarian aid. Internal communication in the Croatian Red Cross takes place through personal communication (face to face), through written and printed media (brochures, newsletters) and via electronic media (e-mail, webseite www.redcross.hr). Aware of how important good communication for everyday tasks as well as for the image of the Red Cross, a variety of training has been organized for staff and volunteers from the domain of humanitarian work and activities.