Collins, William

Bill Collins, an agent with the Chicago office of the A.T.F., presents himself as a sleazy, nosy government agent who fancies himself as Eliot Ness. He is investigating a gun-running operation, but has encountered numerous dead ends. Desperate for assistance, he 'enlists' Rally and May's help by holding the gun shop's license as insurance.
Although they initially succeeded by shutting down a distribution point in Chicago, Jonathan Washington, the sole witness, along with five A.T.F. agents, are murdered in a safehouse by the assassin Natasha Radinov, who uses Collins' cardkey and access code to gain entry. The investigation is now set to be closed, and Collins soon uncovers a conspiracy within the A.T.F. involving his superior George Black and mayoral candidate Edward Haints, who has Rally as a target. (From Wikipedia)