The Republic by Plato Part 9 Page 16

When such men are only private individuals and before they get power, this is their character; they associate entirely with their own flatterers or ready tools; or if they want anything from anybody, they in their turn are equally ready to bow down before them: they profess every sort of affection for them; but when they have gained their point they know them no more.

Yes, truly.

They are always either the masters or servants and never the friends of anybody; the tyrant never tastes of true freedom or friendship.

Certainly not.

And may we not rightly call such men treacherous?

No question.

Also they are utterly unjust, if we were right in our notion of justice?