They were a drug trafficking organisation well before the BMF title. Also i think a few of you are getting hung up on the mafia title. Drug trafficking is an organised criminal activity and they pretty much fit into many definitions of organised crime.
Organised crime can be defined as serious crime planned, coordinated and conducted by people working together on a continuing basis. Their motivation is often, but not always, financial gain. Organised criminals working together for a particular criminal activity or activities are called an organised crime group.
do you have any evidence of that? a search of the archives yields zero results for "Demetrius flenory", "terry flenory", or "black mafia family" prior to the year 2003. if they were such a big deal in the 80's and 90's, they would have been mentioned alongside YBI, Best Friends, etc but they never were. bmf was a rap label, it's more accurate to consider them a fourth rate emulation of death row, bad boy, and so on, instead of comparing them to the mafia.