Adam Smith supported mildly progressive taxation. Rothbard is quite critical of Smith over this. 
I wrote about this in my PhD thesis (easily available online), where I show that Smith can be construed as even more progressive than Rothbard thought.

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Eric Schliesser
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Ghent university 
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On 3 jun 2010, at 17:49, CARLOS RODRIGUEZ BRAUN <[log in to unmask]> wrote:

Among the old fallacies that have enjoyed a renaissance with the current economic crisis is the supposedly impeccable idea of taxing "the rich". I think that classical economists favoured in general indirect against direct taxes, and did not support a permanent income tax, and even less a progressive one. Can J.S.Mill stand as an exception? Was there an economist who supported progressive taxation in the classical period, or perhaps before?
 
Carlos Rodríguez Braun