What is the Morag Tong in the elder scroll game series

The Morag Tong (Forester's Guild) are a legally sanctioned, secretive guild of assassins that originated in Morrowind. They are said to have been founded by the daedric prince Mephala as a way to destroy enemies of the Chimer people using conspiracy and murder. Sometime during their past, the group splintered, creating another faction which is more well known, the Dark Brotherhood.

Their 'legal status' in Morrowind gives them the authority to issue their agents with an official 'Writ of Execution' which the assassin will present to the authorities immediately after making their kill. This writ absolves the assassin of the murder, and he is set free.

The order was said to have been dissolved when Morrowind was rendered uninhabitable due to the eruption of Red Mountain. However in Skyrim's expansion, Dragonborn, Morag Tong agents are encountered.