outside of Baltimore, informs Mouzone of Stringer's upcoming visit to his construction site. Mouzone and Omar corner him and shoot him to death. Colvin tells McNulty about Avon's hideout and armed with the information gleaned from selling the Barksdale crew pre-wiretapped disposable cell phones, the detail stages a raid, arresting Avon and most of his underlings. Barksdale's criminal empire lies in ruins and Marlo's young crew simply moves into their territory. The drug trade in West Baltimore continues. Season 4 The fourth season concentrates on the school system and the mayoral race. It takes a closer look at Marlo Stanfield's drug gang, which has grown to control most of western Baltimore's trafficking, and Dukie, Randy, Michael, and Namondfour boys from West Baltimoreas they enter the eighth grade. Prez has begun a new career as a mathematics teacher at the same school. The cold-blooded Marlo has come to dominate the streets of the west side, using murder and intimidation to make up for his weak-quality drugs and lack of business acumen. His enforcers Chris Partlow and Snoop conceal their numerous victims in abandoned and boarded-up row houses where the bodies will not be readily discovered. The disappearances of so many known criminals come to mystify both the major crimes unit investigating Marlo and the homicide unit assigned to solve the presumed murders. Marlo coerces Bodie into working under him. McNulty is a patrolman and lives with Beadie Russell. He politely refuses offers from Daniels who is now a major and commanding the Western District. Detectives Kima Greggs and Lester Freamon, as part of the major crimes unit, investigate Avon Barksdale's political donations and serve several key figures with subpoenas. Their work is shut down by Commissioner Ervin Burrell at Mayor Clarence Royce's request, and after being placed under stricter supervision within their unit, both Greggs and Freamon request and receive transfer to the homicide division. Meanwhile, the city's mayoral primary race enters its closing weeks. Royce initially has a seemingly insurmountable lead over challengers Tommy Carcetti and Tony Gray, with a big war chest and major endorsements. Royce's lead begins to fray, as his own political machinations turn against him and Carcetti starts to highlight the city's crime problem. Carcetti is propelled to victory in the primary election. Howard "Bunny" Colvin joins a research group attempting to study potential future criminals in the middle school population. Dennis "Cutty" Wise continues to