How did this happen without without SOPA or PIPA? The same way all federal cases happen, a grand jury issued an indictment. In 2010, over the Thanksgiving weekend the US Immigration and Customs Enforcement seized 82 domains, and a year later admitted some were a mistake. And Thanksgiving weekend of 2011 they seized 150 domains.
So the DoJ has done a great job in proving that SOPA and PIPA are not needed. Not only can they seizes domains, property, and arrest those involved with foreign "rogue" sites, they can do it all without due process. Killing a business and then having a trial (or not even having a trial in the case of Dajaz1) is like executing a suspect and then holding a trial to convict them. Even if Megaupload is found not guilty, they will likely never recover from having $50 million in assets seized, the company has been killed but not convicted.
This kind of skirt around due process makes sense in some cases. If you suspect someone is a terrorist and has a bomb in their backpack it makes sense to arrest them and blow up their backpack, then hold a trial. Hundreds of lives are at risk if a bomb goes off, destroying a $30 backpack does little harm, it's fair.
The DoJ have been so brainwashed by the RIAA and MPAA that they think pirated entertainment is as dangerous as terrorism. In 2010 Universal Music Group made $5.7672 billion in revenue. Maybe Megaupload cost them $100,000 in revenue, so without Megaupload UMG would have made $5.7673 billion. No one is dying because of Megaupload. Of course the DoJ doesn't say it cost them $100 thousand, they say Megaupload cost the industry over $500 million. They use funny math for that, like when Arista Records requested damages of $150,000 per infringing file. Or that every download of a movie costs the industry the $45 retail price of a Blu-ray disc. Realistically the amount that piracy actually costs the entertainment industry is tiny, and probably less than the amount they spend on the MPAA and RIAA.
Seriously, SOPA and PIPA are not needed. Laws and legal processes already exist to protect intellectual property. What we really need is a law to protect due process, like the Due Process Guarantee Act that Dianne Feinstein introduced. That act protects due process for terrorist suspects. Yet Dianne Feinstein is sponsoring PIPA. Apparently she thinks terrorist deserve more rights than web site owners. Guess who I'm not voting for next Senate election.