Hacktivist

A computer hacker who breaks into systems to further an activist agenda.

Example Citation:

"Members of the Hong Kong Blondes, a covert group, claim to have gotten into Chinese military computers and to have temporarily shut down a communications satellite last year in a 'hacktivist' protest. 'The ultimate aim is to use hacktivism to ameliorate human rights conditions,' says Oxblood Ruffin, a member of the Toronto-based Cult of the Dead Cow (www.cultdeadcow.com), one of the oldest hacker groups in North America, who serves as unofficial spokesman for the having-more-fun Blondes."

—Bay Fang, "Chinese 'hacktivists' spin a Web of trouble," U.S. News & World Report

Source: Word Spy