There is no contracts concluded forever

The agreement of the establishment of trade unions is the source of the labour law, and at the same time - the civil agreement. That's why you can terminate it collectively, without the need to modify each contract separately.

As recognized by the Supreme Court in its judgment of 5 November 2015 (III CP 26\/15).
Comment by Michał Tomczak for "Rzeczpospolita" of 4 th February 2016.

All article here /in Polish only/

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