Major strikes of December 1981 took place in the following enterprises: - University of Łódź (December 13–15) - Gdańsk Shipyard (December 13–16). Security forces tried to pacify it several times, finally managing to do so. 1,500 workers are fired after the protest. - PZL-Świdnik (December 13–16). Pacified by the ZOMO in the night of December 15/16. The factory is militarized, 40 people are arrested. - Wujek Coal Mine in Katowice (December 13–16), see Pacification of Wujek. - Lenin Steelworks in Nowa Huta (December 13–17). Pacified by the ZOMO in the night of December 16/17.