Known infamously as “Barrio 18,” the 18th Street gang stands among the most dangerous and violent criminal organizations in the Western Hemisphere. Its origins trace back to the 1960s, born from a rift within the Hispanic gang community in Los Angeles. At that time, Clanton 14, one of the city’s oldest Hispanic gangs, resisted widening its membership to include non-Mexicans.

This exclusion prompted a group of young Mexican-Americans to break away and establish 18th Street. Unlike its predecessor, this new gang embraced diversity, recruiting members from various nationalities and becoming one of the first multiracial gangs in the region. Such inclusivity only fueled its growth and notoriety.

In contemporary times, Barrio 18 operates through a network of loosely organized cells, often referred to as “cliques.” These cliques typically answer to a regional leader who orchestrates their activities, as detailed by the Department of National Intelligence. This decentralized structure allows the gang to maintain influence over vast areas.

The gang’s profile skyrocketed during the 1992 Los Angeles riots. In a rare show of unity, rival gangs joined forces against the LAPD following the controversial acquittal of four white officers implicated in the brutal beating of Rodney King, an African-American man. This event marked a significant moment in the gang’s history, underscoring its capacity for strategic alliances.

In a twist of history, The California Post recently highlighted a resurgence of such alliances among Los Angeles’s most notorious gangs. These groups have come together once again, driven by a shared objective to capitalize and generate profit, echoing past collaborations for mutual benefit.

Most recently, as The California Post reported, history repeated itself — as an alliance between the city’s most infamous gangs grew in order to make money.

MS-13 and 18th Street — once sworn enemies — set aside differences and decades of violence to form a “super gang,” cashing in on drugs, extortion, and a booming underground casino trade that now rivals narcotics for profitability.

18th Street works as a transnational organization, building its criminal empire around drug trafficking, human smuggling, and intimidation through violence — including murder.

To move up in the ranks, members must commit heinous crimes that further the gang’s interests, according to the Department of Justice. 18th Street often targets rival gangs, their own members who violate their rules, and people whom they believe snitched to law enforcement.

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The gang also often extorts street vendors and the homeless, requiring “rent” for residing in their controlled areas — failure to pay can turn into a death sentence.

In 2013, a member of the 18th Street gang was sentenced to life in prison after attempting to kill a street vendor who failed to make a $50 payment. The vendor was shot four times, but miraculously survived; however, a 23-day-old infant sleeping in a nearby stroller was struck and killed, according to federal law enforcement officials.

With upwards of 50,000 members, 18th Street is one of the largest criminal organizations in the world and was officially designated a Foreign terrorist Organization and Specially Designated Global Terrorist in September 2025.