For g*d's sake, the government of apartheid South Africa employed black policemen, Vosem.
Forced labor isn't a very good example, opebo (I just dare you to reply with anything other than 'all labor is forced')
What are you talking about? Black policemen under the apartheid government weren't 'forced' to be policemen, any more than black Republicans are 'forced'. They're just looking for career advantages.
The point is that an organization employing a particular oppressed class doesn't mean it isn't an oppressive organization.