First thing that comes to mind is similar to the OP. A leader who uses other people to break the law/do his bidding.

However, LE offers a fair bit of diversity. I like the idea of an LE assassin (not necessarily the class Assassin, either). You're totally cool with killing people, but you have a personal list of requirements that must be met on the target, or there are organizational/personal doctrines on the execution of the objective.