ὀλιγαρχεῖσθαι
From LSJ
τὸ δὲ ποιεῖν ἄνευ νοῦ ἃ δοκεῖ καὶ σὺ ὁμολογεῖς κακὸν εἶναι: ἢ οὔ → but doing what one thinks fit without intelligence is—as you yourself admit, do you not?—an evil
Greek > English (Woodhouse Verbs Reversed)
(see also ὀλιγαρχέω): be governed by an oligarchy
Lexicon Thucydideum
paucorum imperio uti, to be under the rule of a few, 5.31.6, 8.63.3, 8.63.38.76.1, 8.91.3.