Markus Hess, a German citizen, was a computer prodigy and particularly effective hacker. Hess was recruited by the KGB to be an international spy with the objective of securing U.S. military information for the Soviets. Alongside fellow hackers Dirk Brzezinski and Peter Carl, Hess hacked into networks of military and industrial computers based in the United States, Europe and East Asia, and sold the information to the Soviet KGB for US$54,000. During his time working for the KGB, Hess is estimated to have broken into 400 U.S. military computers. The hacked material included "sensitive semiconductor, satellite, space, and aircraft technologies".