Poland
From the 1970s industrial zone in the suburbs of the coal-mining city of Katowice was a significant centre of a fight against the regime. Year 1981 was one of the peaks in the manifestation of discontent. As a reaction to burdensome situation of the majority of the population living under the subsistence, collective strikes and convulsions were at run. In order to hinder the possible social changes, the government imposed martial law. Among others it also meant absolute control and disconnection of all communication canals, introduction of censorship, control of personal mail and restriction in free moving of civilian. Isolated strike centers were forced to use alternative methods to exchange information.