Checkmate (comics)
Checkmate, a division of Task Force X, is a fictional covert operations agency within the DC Comics universe. It first appeared in Action Comics #598 and proceeded to have its own ongoing title in Checkmate!. In the wake of events depicted in the mini-series The OMAC Project and Infinite Crisis, Checkmate had been re-chartered as a United Nations Security Council-affiliated agency and had its own series, Checkmate (vol. 2).
Read more about Checkmate (comics): Publication History, Known Employed Operatives, Collected Editions