History of the Peloponnesian War

Those of the Samians who had risen up against the aristocratical party, and constituted the commons, turning round again, and being prevailed upon by Pisander on his arrival, and by the Athenians who were in the conspiracy at Samos, both bound themselves by oaths to the number of three hundred, and were prepared to attack the rest, as forming the democratical party.

They also put to death one Hyperbolus, an Athenian, a base fellow, who had been ostracised, not from fear of his influence or rank, but for his villany, and for being a disgrace to the city; acting in the matter in concert with Charminus, one of the generals, and a party of Athenians who were with them, and to whom they had given pledges of faith. They likewise perpetrated other such deeds in conjunction with that party, and had determined to make an attack on the populace.