Ronnie Mo ran the drug dealing operation in "The Pit" for the Barksdale organization before D'Angelo Barksdale. Ronnie Mo's promotion to overseeing Building 851 as a crew chief came prior to the beginning of the series. Before the promotion, he worked with Bodie, Poot and Wallace in the low rises. Ronnie Mo is seen flirting with dancers at Avon's strip club. He is arrested by Detective Hauk, when the Barksdale investigation comes to an end, and is sentenced to fifteen years due to prior felonies.