you might find the song Die Moorsoldaten of interest. There was also an English cover of this by folk great Luke Kelly (of the Dubliners??) called the Peat Bog Soldiers. As I recall this has to do with the first Nazi KZ (concentration camp.)

Also there is a song called >>Arbeitlosen Marsch<< or Unemployeed March.

There are a number of websites dedicated to such music, for example:

http://www.pds-regensburg.de/fun/songs/Default.htm
(songs of the former GDR from the successor of the Socialist Unity Party)