Adam Clarke on Acts 19:38

If Demetrius - have a matter against any man - If it be any breach of law, in reference to Demetrius and the artists, the law is open, αγοραιοι αγονται; these are the terms of law, public courts, times of sessions or assize; or, rather, the judges are mow sitting: so the words may be understood. And there are deputies, ανθυπατοι, proconsuls, appointed to guard the peace of the state, and to support every honest man in his right: let them implead one another; let the one party bring forward his action of assault or trespass, and the other put in his defense: the laws are equal and impartial, and justice will be done to him who is wronged.