The demo scene on the ZX Spectrum can probably be traced back to Castor Cracking Group and a few other groups back in 1986. The Speccy demo scence was slow to start, but it started to rise in the late 1980s, most noticably in eastern Europe.
... Eventually it took orders from Supreme Headquarters of Allied Expeditionary Force[?] (SHAEF). Resistance members concentrated on information collection and sabotage ...