S16, E5: After Detectives Fontana (Dennis Farina) and Green (Jesse L. Martin) discover the body of a murdered prostitute in the alley of a Hispanic bordello, they learn that the victim was an undercover reporter who was planning an expose about the L-12, a pervasive gang of thugs who coerced a businessman (guest star William Sadler) to commit the crime. But Assistant D.A. McCoy (Sam Waterston) soon realizes that the reluctant slayer is only trying to protect his imprisoned son (guest star Brad Fleischer) from the gang's abusive tentacles - and that no one is beyond their bloody reach. Annie Parisse, Fred Dalton Thompson and S. Epatha Merkerson also star.