MS-13's biggest rival: Barrio 18

Hispanic gang Barrio 18 has been compared to his most fierce rival, MS-13. What are the origins of Barrio 18, or M-18? What does it have in common with MS-13 and what makes Barrio 18 different?


(Source: Fox News, https://www.youtube.com/watch?v=AWMqkyvTE6o)