Bele in 2268
Bele was from Cheron, and was the chief of the commission on traitors. Fueled by racial bigotry against the people who were the opposite color from himself, he was white on the left side and black on the right side, he pursued a traitor named Lokai across the galaxy, until he found him on the USS Enterprise in 2268.
When Kirk refused to help him, he hijacked the Enterprise, and returned to Cheron, only to find that years of racial tension had destroyed his world. Lokai beamed down to the dead planet, and Bele followed, still obessed with bringing him to his warped sense of justice. (TOS: "Let That Be Your Last Battlefield")