'Accusers' in the Bible

When I was informed that there was a plot against the man, I sent him to you right away. I also ordered his accusers to state their case against him in your presence.

he said, “I will give you a hearing whenever your accusers get here too.” And he ordered that he be kept under guard in Herod’s palace.

But Lysias the commander came and took him from our hands with great force,

I answered them that it’s not the Romans’ custom to give any man up before the accused confronts the accusers face to face and has an opportunity to give a defense concerning the charges.

Concerning him, the accusers stood up and brought no charge of the sort I was expecting.