I have it in a songbook which has notes to each song but this. However, the songs in this book are in historical order and this song is the last, that is the newest one. The songbook is from 1975 and the song is hardly much older. As Jimmy has presumed the song is about the internment, but I'm sure it is about the internment in the 1970s, written at about the same time (and in the same spirit) as 'Men behind the wire'.

Wolfgang