As social organizations, labor unions place special emphasis on the active participation of their members. In this way, labor union leaders expect not only to safeguard their union’s smooth operation but also to increase their negotiating powers, and defend vigorously working employees’ rights as well as put forward demands for new ones. In recent decades, securing rights to permanent employment as well as many other achievements of the union movement have been increasingly challenged. In addition, modern societies like Greece seem apprehensive as regards demands put forward by labor unions. The appeal of economic liberalization and globalization policies could provide an initial explanation for this phenomenon. However, it is not just the global economic situation and policies that have challenged the dynamics of the union movement nowadays. Attention has to be shifted to the internal environment of the labor unions such as Teachers’ Federation of Greece. This might better explain the limited participation of employees like Greek teachers in their union’s actions and proceedings, such as strikes, stoppages, and public demonstrations.