»The Concept of Unions under the Co-Determination Act of 1976 as Determined by the Constitutional Right of Freedom of Association«: Against the background of the realization that corporate co-determination is enshrined in Article 9 (3) of the German Constitution as a fundamental right of equal rank to collective bargaining autonomy, this dissertation elaborates the constitutional requirements for the simple legal formulation of corporate co-determination through the Co-Determination Act of 1976 (MitbestG). These then form the basis for a constitutional interpretation of the concept of unions under the MitbestG.