Workers' Defence Committee
During the late 1970s some Jewish activists were engaged in the anticommunist opposition groups. Most prominent among them, Adam Michnik (founder of Gazeta Wyborcza) was one of the founders of the Workers' Defence Committee (KOR). By the time of the fall of Communism in Poland in 1989, only 5,000–10,000 Jews remained in the country, many of them preferring to conceal their Jewish origin.