Beef between two label companies; Murder Inc (Ja Rule, Ferrari Black, Irv Gotti) and Shady/Aftermath (Eminem, Obie Trice, Dr.Dre, 50 Cent).
Started when Ja Rule saw 50 Cent hanging out with a man who had in the past robbed Ja Rule. Ja Rule then started dissing 50 Cent and just like WWI, allies were drug into the beef.