DANCING THE SPANDAU BALLET

Spandau is a fortress, once used as state prison for Prussian state offenders, on the outskirts of Berlin.
When the Kingdom of Prussia existed, Spandau was its confinement quarters for the most relevant offenders in the land (Küstrin, in the provinces, on the Eastern border at the confluence of the Oder and Warthe, ranked second). Spandau was the Bastille of Prussia, to say it with the right words.
In the Kaiser era (pre-WW1), the fortress of Spandau served no longer as state prison, but as armaments factory and arsenal for the Hohenzollern government. The expression "to dance the Spandau ballet", coined in WW1, is given as one of the reasons for the band's name... There are more theories, given by the band itself, about its possible names.
They changed the band's name to Spandau Ballet after a friend of the band, journalist and DJ Robert Elms, saw the phrase "Spandau Ballet" scrawled on the wall of a nightclub lavatory during a visit to Berlin. The expression "Spandau Ballet" was slang used by Allied troops in the trenches in the First World War referring to the twitching of the corpses hanging on the barbed wire and repeatedly hit by Spandau machine gun fire from the German lines. The name also refers to Spandau Prison (the Bastille of Prussia, ut supra) and the many hangings there, especially in 1945–46 of Nazi war criminals, when the victims would twitch and jump at the end of a rope.