Who, in this case, is the United States Congress. Wil Wheaton has said it much more eloquently (and ferociously) than I. 1984, anyone?
I think scholars should be particularly concerned, given "fair use" paradigms currently in play and possibilities that SOPA/PIPA could eventually bring to pass. After all, the free exchange of ideas is the most valued idea of the university setting, and the Internet has allowed that to be the closest reality it's likely to get in our lifetimes.
So contact your congresspeople and let them hear your voice. This is one bill the American public CAN--and IS--killing. You want to stop piracy? Great. But don't take away a free and open Internet--for people in and beyond the United States--to do it.
ETA: Want more info on exactly why it's bad? Read this article, originally from Mashable, on "Why SOPA is Dangerous."