During the next few months, as the Thirty consolidated their hold on the institutions of government, they arrested, confiscated the property of, and summarily executed a wider and wider swath of Athenian citizens and resident aliens (metics).  At every step, Critias was the leading advocate for more extreme levels of violence, to the point where he was getting resistance even from within the Thirty.  The leading “moderate” was Theramenes, and his continued cautioning against the continuing destruction ultimately got him arrested and executed at Critias’ direction.Xenophon, Hellenica, ii.3.21-55.
