Protect IP Act, Stop Online Piracy Act (Sopa) could affect the growth of the internet.
Relevant links
http://www.bbc.co.uk/news/technology-16195344
http://www.tehelka.com/story_main51.asp?filename=Op171211proscons.asp
http://www.wired.com/beyond_the_beyond/2011/12/internet-engineers-dont-like-pipa-and-sopa/
https://www.eff.org/deeplinks/2011/12/internet-inventors-warn-against-sopa-and-pipa