Rock

Rock is a mechanical-augmented drug dealer in the Brooklyn Bridge.

In-game
Rock is located at the southeast corner of the Brooklyn Bridge Station and will offer to sell you zyme. The player can press Rock for information and telling him that you work for UNATCO will initiate a firefight with him.

El Rey, the leader of gang called Rooks, will ask JC to "take care of" Rock, in exchange for a LAM. Apparently Rock is dustrupting the gangs buisnesses. If you knock Rock unconscious, El Ray will send someone else to finish the job, but he'll still give you the LAM.