The Unknowns
The Unknowns is a self-proclaimed ethical hacking group that came to attention in May 2012 after exploiting weaknesses in the security of NASA, CIA, White House, the European Space Agency, Harvard University, Renault, the United States Military Joint Pathology Center, the Royal Thai Navy, and several ministries of defense. The group posted their reasons for these attacks on the sites Anonpaste & Pastebin including a link to a compressed file which contained a lot of files obtained from the US Military sites they breached. The Unknowns claim "... our goal was never to harm anyone, we want to make this whole internet world more secured because, simply, it's not at all and we want to help." The group claims to be ethical in their hacking activities, but nonetheless lifted internal documents from their victims, posting them online. They claim this was because they had reported the security holes to many of their victims, but did not receive a response back from any of them. The whole point was to show that these government-run sites have loopholes in their code and anyone can exploit them. The group used methods like advanced SQL injection to gain access to the victim websites. NASA and the ESA have both confirmed the attack. They claimed that the affected systems were taken offline and have since been patched. At the time this was one of the most wanted hacking groups in Europe and also wanted by the FBI, although they refused to tell if they were investigating the hacks. Members 
The team had 6 not 7 core members:
 Pixiedust, founder, spokesperson, and leader,
 Mr. P-Teo, programmer

 Fabien Léac,a French researcher in computer faults and a white hacker
 MrSecurity, a black-hat hacker, programmer and ghostwriter of The Unknowns
 NeTRoX, a black-hat hacker, penetration tester and researcher. Joined to the team in late 2015 after the team reunited. Jail 
Zyklon B, who lives in France, was arrested by the French Intelligence Service on June 24, 2012. He was later released because he was just sixteen years old at the time. He has trials taking place in 2014 supposedly. His life is related in a book written by his mother Sophie Léac L'histoire vraie d'un jeune hacker français (in October 2013) or the true story of a French teen-hacker. A second book is in preparation: Hack! There will be cyberwar!. Hacked websites and applications 
The group has hacked many websites and applications using a series of different attacks. The most notable, however, being SQL injection. There have been a lot of companies affected by the group, but some of the hacks even for big companies did not make the media (probably due to keeping the multi-country legal investigation a secret). However, the most notable hacks done by The Unknowns, mostly government related websites, did make mass media. The group is still active, and the members are still working together, as they try to make the internet safer. SQL injection attacks were used on the following:

 Asian College of Technology
 Bahrain Defense Force
 California State University
 Christian Mingle
 Deutsche Federal Government
 European Space Agency
 ESET
 French Ministry of Defense
 Harvard University
 Jordanian Yellow Pages
 Lawrence Livermore National Laboratory
 United States Navy
 NASA
 Ames Research Center
 Glenn Research Center
 New7Wonders
 Renault
 Royal Thai Navy
 Sempra Energy
 Social Democratic Party of Germany
 United Kingdom Ministry of Defense
 University of Rhode Island
 United States Military
 United States Air Force
 United States Department of Commerce
 United States Department of the Treasury
 PayPal, no information was released. The Unknown contacted PayPal with the exploits he/she found and received $1,000 as a reward. However they have used different attacks:

 Two United Kingdom police servers were exploited and root access was gained to the systems. Not much is known about this attack. Abolished 
The purpose of The Unknowns was to find security issues in high-profiled websites and to get them patched. The information from the hacked sites was released because The Unknowns attempted to make contact with all their targets informing them of the security issues, but they did not receive a response back from any of the websites targeted. Some data was leaked to force these websites to patch their systems. After a period of hacking high-profile websites, The Unknown disbanded the group in 2012 but reunited it in the early 2015. References
List of hacked websites/companies

Hacker groups