Humanity's Defensive Front (人類防衛戦線, Jinrui Bōei Sensen) is an anti-altered organization that was created by the families of the victims of altered crimes. They are prepared to do anything, including terrorist attacks and even sacrificing their own lives in order to succeed in their mission - killing as much altered they can.
One of their members was Souma, who in order to reveal Area D's coordinates was ready to kill 77 altered and along with 34 normal humans.