From Sheldon Richman, here, quoting Adam Smith:
"The proposal of any new law or regulation of commerce which comes from this order [that is, 'those who live by profit'], ought always to be listened to with great precaution, and ought never to be adopted till after having been long and carefully examined, not only with the most scrupulous, but with the most suspicious attention. It comes from an order of men, whose interest is never exactly the same with that of the public, who have generally an interest to deceive and even to oppress the public, and who accordingly have, upon many occasions, both deceived and oppressed it."
Smith grew up under mercantilism and knew well of what he wrote. America grew up largely under mercantilism and its cousin, Hamiltonian-Lincolnian corporatism. In this respect advocates of the freed market should embrace Smith’s understanding of political economy: that a powerful force against freedom emanates from where they might least expect to find it.