'Accusers' in the Bible

Since a plot against the man has been reported to me, I'm sending him to you at once, and I've also ordered his accusers to present their charges against him before you."

he said, "I will hear your case when your accusers arrive." Then he ordered Paul to be kept in custody in Herod's palace.

I answered them that it was not the Roman custom to sentence a man to be punished until the accused met his accusers face to face and had an opportunity to defend himself against the charge.

When his accusers stood up, they didn't accuse him of any of the crimes I was expecting.