M. Tullius Cicero Pro A. Cluentio 23

[23]
  In the meantime, Oppianicus being, as you will have proved to you by many circumstances, a man of singular wickedness and audacity, by means of some Gaul , his intimate friend, first of all corrupted that informer with a bribe, and after that, at no great expense, managed to have Aurius himself got out of the way and murdered. But they who had gone to seek out and recover their relation, send letters to Larinum , to the Aurii the relations of that young man, and their own intimate friends, to say that the investigation was very difficult for them, because they understood that the man who had given the information had been since bribed by Oppianicus. And these letters Aulus Aurius, a brave and experienced man, and one of high rank in his own city, the near relation of the missing Marcus Aurius, read openly in the forum, in the hearing of plenty of people, in the presence of Oppianicus himself, and with a loud voice declared that he would prosecute Oppianicus if he found that Marcus Aurius had been murdered.