The article gives overview of the impacts of the ECJ rulings in Laval case, the Viking case, the Rüffert case, the Commission vs. Luxembourg case on the practice of collective bargaining and the effectiveness of industrial actions in the European Union. Particularly the consequences of those important judgments on the social dimension of the EU internal market are discussed. Author presents ECJ analysis of relation between economic freedoms and fundamental rights (as a background the Schmidberger case is used). The doubts of European Parliament and concerns of European Economic and Social Committee related to ECJ judgments are presented as well. Author emphasized differences between European Court of Justice and European Court of Human Right attitudes towards perception of right to collective bargaining.