Comité de défense des ouvriers
After the pacification of workers in June 1976, he organized relief in Radom and Ursus. Along with some of his colleagues from "Black One", he created underground structures, which dealt with the monetary, legal, and medical aid for the oppressed. Macierewicz founded the Workers' Defence Committee (KOR), the forerunner of Solidarity. “Macierewicz, more than anyone else, was responsible for the formation of KOR”, notes David Ost, a Professor of Political Science at Hobart and William Smith Colleges.