Plato, Laws 627b

τὸ μὲν τοίνυν εἴ ποτέ ἐστίν που τὸ χεῖρον κρεῖττον τοῦ ἀμείνονος ἐάσωμεν—μακροτέρου γὰρ λόγου—τὸ δὲ ὑπὸ σοῦ λεγόμενον μανθάνω νῦν, ὥς ποτε πολῖται, συγγενεῖς καὶ τῆς αὐτῆς πόλεως γεγονότες, ἄδικοι καὶ πολλοὶ συνελθόντες, δικαίους ἐλάττους ὄντας βιάσονται δουλούμενοι, καὶ ὅταν μὲν κρατήσωσιν, ἥττων ἡ πόλις αὑτῆς ὀρθῶς αὕτη λέγοιτʼ ἂν ἅμα καὶ κακή, ὅπου δʼ ἂν ἡττῶνται, κρείττων τε καὶ ἀγαθή.

Well then, leaving aside the question as to whether the worse element is ever superior to the better (a question which would demand a more lengthy discussion), what you assert, as I now perceive, is this,—that sometimes citizens of one stock and of one State who are unjust and numerous may combine together and try to enslave by force those who are just but fewer in number, and wherever they prevail such a State would rightly be termed self-inferior and bad, but self-superior and good wherever they are worsted.