Benefiting from the normative provisions of a collective agreement concluded within the context of the autonomy of collective bargaining is a requisite and natural conclusion of the said features. In this sense, “solidarity fee” application has a great importance in order to harmonize the collective bargaining autonomy and with individual union freedom in the most equitable manner. A provision which had been enacted towards solidarity fee application with the Act no 6356 and which had had a chance to put the workers, benefiting from collective agreement through payment of “solidarity fee”, in a disadvantageous position against the union member workers has been repealed by the Constitutional Court.