Crowd actions were a common occurrence in Thoreau and Emerson's day. Boston experienced a great deal of labor strife from the 1830s-1850s, and the anti-abolition crowds that attacked William Lloyd Garrison are very famous. And thinking people were concerned by these events. I think they would probably approve of some of the message that is coming from the OWS folks, who ultimately are unhappy with many of the same forces they were unhappy with. In reality, however, neither Thoreau nor Emerson were comfortable with popular democracy. As Thoreau said in Civil Disobedience, "there is but little virtue in the actions of the masses of men." Thinking men of their time and place were concerned over "mob rule" and the "tyranny of the majority." Protest for them was an individual act of conscience to be undertaken by educated men. Of the two, I think Thoreau would have been more likely to approve of the protests, but looking at the two figures in their historical context shows, in my opinion, that neither approved of crowd action. That doesn't mean that it's wrong, just that nineteenth-century philosophers probably wouldn't have approved of it.