Yeah they say Marlo was based Timmirror Stanfield and his half brother Marlowe Bates mostly and also a guy named Linwood Williams. All Baltimore kingpins who all murdered a lot of people. Timmirror and Marlowe are both doing life in prison for multiple bodiesnot only Prince from The Supreme Team is the closest to what a real life Marlo probably was, he also looked like a lightskin version of him. Jamie Hector def coulda played him
Marlo having that security guard killed is based on a real life incident when Linwood Williams had an argument with a security guard at a local grocery store and had him killed soon after.
Marlowe Bates actually has a website: Through The Wire – The true Marlow Stanfield Story