I've not read the whole bill, yet, but my initial impression is that it's not trying to suppress "free speech". My impression is that it's trying to suppress copywrite infringments and other infringments by those who do not recognize such rights and to that I say "Hooray!"
Here's a link to a copy of the bill.
http://static.arstechnica.net/2011/10/26/SOPA.pdf
--Jeff Moden
Change is inevitable... Change for the better is not.