Chronicling the life and times of several drug lords, Cocaine Cowboys is a great documentary. The first installment takes place mainly in Miami in the 70s and 80s, giving detailed accounts of shoot outs and deals made surrounding the heyday of violence and excess that defined this South Eastern American area.
The second movie picks up after the majority of the "cowboys" have been either killed or put in jail. A young up and coming dealer from Oakland writes to La Madrina or "The Godmother", Griselda Blanco, while she is in prison. He becomes her lover and number 1 lieutenant. Both movies are very compelling and give interesting insight into the world of criminal activity surrounding the highly risky and highly lucrative yayo trade.