Hertha were definitely a Western team. There is a chapter in Simon Kuper's Football Against the Enemy about a Hertha fan who lived in the East, and after the wall went up and he couldn't see the team anymore he became obsessed with Western football and supported the West German national team. He got into a lot of trouble with the Stasi for doing things like traveling around communist Europe to watch Bayern and other capitalist teams.
Herta were definitely a Western team. There is a chapter in Simon Kuper's Football Against the Enemy about a Herta fan who lived in the East, and after the wall went up and he couldn't see the team anymore he became obsessed with Western football and supported the West German national team. He got into a lot of trouble with the Stasi for doing things like traveling around communist Europe to watch Bayern and other capitalist teams.