"Operation Payback," as they call it, was planned by a select few 4chan-elites. They targeted attacks on torrent sites, aiming to DDoS piracy opponents. Initial reaction then increased into an attack on big business, law firms, and individuals. Ultimately affected, organizations that had condemned WikiLeaks prior.
As you may know, it is not illegal to leak confidential information. It is, however, illegal to obtain it. Assange leaked it, he did not obtain it. The people who obtained it are unknown.
Information leaked includes cables stating future plans to launch probes, attacks, information consistent with other country's weapons arsenal, etc.
Could this possibly be the first cyber war?