A law professor from the Santa Clara University School of Law thinks the prosecution of Megaupload is unconstitutional and an abuse of government authority.
While there could be a small amount of provable criminal copyright infringement—under our modern overexpansive criminalization of ordinary daily activities—for infringing files the Megaupload principals uploaded themselves, the government ordinarily wouldn't have cranked up its massive machinery for those violations. After all, millions of Americans routinely commit violations like that, and mass panic would be at hand if the government exercises its prosecutorial discretion so loosely.