A recent judgment of the Supreme Court (of 7 April 2010; II PK 342/09) allows the employer to sue a union activist to establish his/her rights, for example whether the number of hours claimed for union work is substantiated by the number of members. In such a suit the number of union members is subject to verification by the court.

The judgment is currently known from the press only. Under Polish law, courts are not legally obligated to follow Supreme Court judgments.