In the world of information technology, black hat hackers (also known as crackers or cyber-criminals) are known as the bad guys or villains. Most of them break into computers or networks without authorization to steal money and classified and sensitive information, while others are doing it simply for the challenge or the thrill of hacking. To accomplish their sinister work, crackers often create malware (malicious software) like viruses and worms to gain control of computer systems.
Gary McKinnon has been accused of what one US prosecutor claims is the "biggest military computer hack of all time".
That's nothing compared to recent events at Wikileaks.