Sorry I can't help with your quote. But Smith is certainly not as bad as liberals make out. For instance in The Wealth of Nations he clearly takes a swipe at private property -- something liberals don't like to mention too loudly.
In that original state of things, which precedes both the appropriation of land and the accumulation of stock, the whole produce of labour belongs to the labourer. He has neither landlord nor master to share with him.Had this state continued, the wages of labour would have augmented with all those improvements in its productive powers to which the division of labour gives occasion. All things would gradually have become cheaper. They would have been produced by a smaller quantity of labour; and as the commodities produced by equal quantities of labour would naturally in this state of things be exchanged for one another, they would have been purchased likewise with the produce of a smaller quantity.
EDIT: And if you don't already have it: here is a quote by David Hume (a close friend of Adam Smith):
Nothing appears more surprizing to those, who consider human affairs with a philosophical eye, than the easiness with which the many are governed by the few; and the implicit submission, with which men resign their own sentiments and passions to those of their rulers. When we enquire by what means this wonder is effected, we shall find, that, as Force is always on the side of the governed, the governors have nothing to support them but opinion. It is therefore, on opinion only that government is founded; and this maxim extends to the most despotic and most military governments, as well as to the most free and most popular.

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I found a brilliant quote by Adam Smith in Class War's book Unfinished Business, but as it did not say where it was from, I'm leery about using it. Does anyone know where they got the quote:
"Law and governments may be considered in this and indeed in every case as a combination of the rich to oppress the poor and preserve to themselves the inequality of the goods which would otherwise soon be destroyed by the attacks of the poor, who if not hindered by the government would soon reduce the others to an equality with themselves by open violence."
If anyone could help, that'd be great. I'm trying to write an essay on The State, so it would be brilliant. Thanks.