Freedom of association has its origins in an idea of civil society. The civil society with long and complex history becomes a fundamental element in a nowadays discourse on a well governed state. In such context an act of accession of Poland to European Union means integration with societies associating in various chains of associations, organisations, fundations, trade unions etc. – in the frame of what we used to call a civil society. Freedom of association is an essential element among other political rights and liberties. Trade unions, for example, are a form of association. Basically, they are associations of workers organised to protect the interests of their members in front of the employer. A trade union can represent the rights of employees more efficiently than an employee itself. The Constitution of the Republic of Poland of the 2nd April 1997 expresses freedom of association as a civil freedom. The Constitution emphesizes the particular role that trade unions play in accomplishing the rules of pluralism. The freedom of association in trade unions is guaranteed by article 59 of the Polish Constitution. The legislative system of the Third Republic of Poland secures favorable conditions for the development of pluralism and reinforces democratic law order and the idea of civil society