Byron is a thuggish white supremacist, and a member of the Aryan Nation. He is the leader of a group attempting to kill Leon Tao after he loses nearly $8,000,000 of the gangs money.
Byron took Bear from his previous owner, who couldn't afford to pay back the Aryan Brotherhood. He also captures both Fusco and Leon and begins interrogating Leon about the stolen bearer bonds before Reese shows up and rescues them along with Bear. He ends up being thrown out of a window by Reese. (“The Contingency”)