Interesting history post at the Engineering Ethics Blog:
During the 1980s, the Communist government of Poland imposed martial law and rigidly suppressed and controlled speech. All media outlets, including radio and TV, were under government supervision. As the Solidarity movement grew, however, a group of radio and television engineers joined with other technical types (mainly university professors) to do (what we would term today) hacking of the official radio and TV networks. Pretty soon after that, TV-watching Poles began to see images of things like the words of the national anthem superimposed on the video feed of dull official programs. Now and then, the audio of the TV channel would give way to music of the national anthem, a joke, or some popular song that had nothing to do with the official program. At other times, Poles listening to their radios began to receive signals from “pirate” radio stations broadcasting information that the government did not want them to hear.
The content of the messages sent by what came to be called “Radio Solidarity” was not as significant as the mere fact that somebody, somewhere, was messing with the government’s system, and could get away with it.
Read the rest.