Mo was a member of the One-Niners.
Mo was hanging out with his fellow gang members on the street. Detective Vic Mackey approached the area with Alvarez, a Latino drug dealer inside. When Alvarez refused to give him some information, Vic opened the window and told Mo that Alvarez had said a lot of nasty things about his sister. Mo and his gang members surrounded the car looking angrily at Alvarez, threatening him if he got out. After Alvarez gave Vic the information he needed, Vic drove away from there.