The Stop Online Piracy Act has a lot of people up in arms. This bill will allow courts to issue injunctions against companies whose websites could potentially be used to facilitate piracy (regardless of what anti-piracy measures they're taking.) That includes many companies like Google, Amazon, Facebook and Paypal. If the bill passes these companies will almost immediately be forced to shut down by court order. In fact the situation is so dire that these companies are planning to shut down their websites for a day:
And if anyone needs more reason to oppose this bill, the biggest supporters are the RIAA and the MPAA. I think that says it all.