Tekashi 6ix9ine took the stand last December as the government’s star witness int he case against Nine Trey Gansgsta Blood members Aljermiah “Nuke” Mack and Anthony “Harv” Ellison. As a direct result of 6ix9ine’s testimony, Mack was convicted of racketeering conspiracy and conspiracy to distribute heroin and fentanyl. According to the New York Post, Judge Paul A. Engelmayer sentenced Mack …