Most recently, "Kal-El (formerly Superman) is having trouble negotiating a peaceful resolution to a very dangerous hostage situation. Members of the planet's labor guild have"
In fact, the labor guild likely adheres to the social code for one or all of three reasons:
1) Civic duty or a utilitarianism
2) Deep sense of Kryptonian tradition
3) Self-interest: they work in exchange for the right to be citizens, to enjoy the planets public resources (the only one I can think of is pretty crystals), and to be protected by the military guild
As is this, from a series of comic strips about someone trying to find a church (click on it for more):