Politics is to politician as law is to what?
A hypernym for lawyer/judge/law student, etc.
Edit: Not only in the legal system, anyone practicing or researching the subject. Maybe politics wasn't the best example.
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I'd generally say legal professionals.
Some of my law textbooks referred to such people as Jurisprudents:
— adj 1. skilled in jurisprudence or versed in the principles of law
— n 2. a jurisprudent person