Bloods members commonly call themselves CKs (for Crip-Killer), MOBs ( Member of Bloods), dawgs, or ballers (meaning drug dealers). The gang has a membership of between approximately 15,000 and 20,000 active in 123 cities and in 33 U.S. states, primarily on the West Coast and. to a lesser extent, the Great Lakes region and the Southeast. Gangs including Bloods have been documented in the U.S. military, in both U.S. and overseas bases. Bloods sets also operate in the Canadian cities of Montreal and Toronto.