Realistically no schools focus on any particularly area of the law. Your first year at any ABA school will be contracts, torts, civil procedure, property, criminal law, constitutional law, criminal procedure, and legal writing. Or some variation on that and you will take the remaining ones in second year. Then evidence, wills & trusts, corporations, trial advocacy will likely be required or highly suggested. Then you will have 20 or so units left.
Some schools may offer an employment and labor law class. Some may also offer a clinic or two at most and you can see this on the course schedules of any schools your into, but no school will focus on labor/employment law completely. ABA schools have to follow ABA guidelines and that consists of the courses listed above.
Hope that is helpful.