I heard about JIDF years ago. The Jewish Internet Defense Force is, I believe, a group which works to protect Jewish internet assets using hacking methods. They counter-hack against anti-Israel hacking groups...
http://en.wikipedia.org/wiki/Jidf
The Jewish Internet Defense Force (JIDF) is an organization that uses social media to mobilize support for campaigns against websites and Facebook groups that promote or praise what it regards as Islamic terrorism or antisemitism. The group's website describes the JIDF as a "private, independent, non-violent protest organization representing a collective of activists".[3] The JIDF's work has been termed "hacktivism" by some media outlets.[4][5]