'Accusers' in the Bible

When I was informed there would be a plot against this man, I sent him to you at once, also ordering his accusers to state their charges against him before you.

he said, "I will give you a hearing when your accusers arrive too." Then he ordered that Paul be kept under guard in Herod's palace.

I answered them that it was not the custom of the Romans to hand over anyone before the accused had met his accusers face to face and had been given an opportunity to make a defense against the accusation.

When his accusers stood up, they did not charge him with any of the evil deeds I had suspected.