"LulzSec (who by then was cooperating with the FBI)"

https://www.justice.gov/opa/pr/wikileaks-founder-charged-superseding-indictment
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In 2010, Assange gained unauthorized access to a government computer system of a NATO country.  In 2012, Assange communicated directly with a leader of the hacking group LulzSec (who by then was cooperating with the FBI), and provided a list of targets for LulzSec to hack.  With respect to one target, Assange asked the LulzSec leader to look for (and provide to WikiLeaks) mail and documents, databases and pdfs.  In another communication, Assange told the LulzSec leader that the most impactful release of hacked materials would be from the CIA, NSA, or the New York Times.  WikiLeaks obtained and published emails from a data breach committed against an American intelligence consulting company by an “Anonymous” and LulzSec-affiliated hacker.  According to that hacker, Assange indirectly asked him to spam that victim company again.