Aristotle speaks to us of the republic of Carthage as a very well-ordered republic. Polybius  tells us that Carthage in the second Punic War faced the problem that the senate had lost almost all its authority. Livy informs us that when Hannibal returned to Carthage, he found that the magistrates and the principal citizens were diverting the public revenues to their profit and abusing their power. The virtue of the magistrates thus fell with the authority of the senate ; it all flowed from the same principle.
The wonders of censorship among the Romans are well known. There was a time when it became oppressive ; but it was maintained because there was more luxury than corruption. Claudius weakened it,  and through this weakening, corruption became even greater than luxury, and censorship abolished itself.