One might read “plaintiffs' bar” as specific as, say, personal injury lawyers representing a single client, all the way up to major mass tort litigation.
What are plaintiffs in a case?
Plaintiff, the party who brings a legal action or in whose name it is brought—as opposed to the defendant, the party who is being sued. The term corresponds to petitioner in equity and civil law and to libelant in admiralty.
Do plaintiffs have lawyers?
When you choose to file a lawsuit, like a personal injury case, you are considered the plaintiff because you initiated the suit. Since you are the plaintiff, your lawyer is the plaintiff attorney because they represent you.