Run the Jewels, also known by the initials RTJ, is an American hip hop super-duo composed of Brooklyn-based rapper and producer El-P and Atlanta-based rapper Killer Mike. They released their critically acclaimed self-titled debut studio album as a free download in 2013 and have since released the follow-up albums Run the Jewels 2 (2014), Run the Jewels 3 (2016), and RTJ4 (2020), all of which have been released for free and received critical acclaim.

Source: Wikipedia (https://en.wikipedia.org/wiki/Run_the_Jewels)