"Both Mara Salvatrucha (MS-13) and the 18th Street gang (Barrio 18) have their origins in California and were started by immigrants from Central America in the 1980s. Both groups gained influence in El Salvador in the 1990s when their founders were deported from the United States to El Salvador.[5] MS-13 is more than twice the size of Barrio 18, the second-most prominent gang in El Salvador. Together, the two account for almost all of the nation's gang violence.[9]: 6 Other notable gangs in El Salvador include Mao Mao, Miranda Loca, and La Maquina.[10]"