Comité de défense des ouvriers
In 1976–77 he lived in Paris. After he returned to Poland, he became involved in the activity of Workers' Defence Committee (KOR), which had already existed for a couple of months. It was one of the best known opposition organizations of the 1970s. He became one of the most active opposition activists and also one of the supporters of the Society for Educational Courses (Towarzystwo Kursów Naukowych).