Trade union NSZZ "Solidarity" was set up at the Maria Curie-Skłodowska University in September 1980. From the beginning it was very popular among University staff. Both lecturers and administrative staff were joining new independent trade union. Its popularity is best proven by the fact that eighty percent of the University staff belonged to the Union at the end of 1980. Except for the fact that the Union was running its common duties, which was making effort for social rights, at that time it began fight for democratization of the country.Its legal activity period lasted until imposition of martial law on December 13th1981. After that the Union continued its activity, but illegally. During that period members of "Solidarity" were being repressed by the government but they could have always counted on their colleagues' help. NSZZ "Solidarity" was finally re-registered in 1988.The present article treats about the formation process of Union's structures between 1980 and 1989.