Who is T-4 from Welcome to the Monkey House and what is their importance?

T-4 suggests the wife and children be put in safer positions, not knowing that there are no safe positions in a chess game. Later, he attacks a guard just after Kelly's son, Jerry, is taken by Pi Ying. He is wrestled to the ground and taken back to his position. In the end, he is the farthest moved piece and takes Barzov's queen