One of America's most violent prison gangs, Barrio Azteca is most active in Texas prisons as well as communities in southwestern Texas and southeastern New Mexico.
Members are often linked to Mexican drug cartels, and the gang's main source of income is the smuggling of heroin, cocaine, and marijuana from Mexico into the U.S. for distribution both inside and outside the prison systems.
The gang has been tied to immigration smuggling, arson, assault, auto theft, burglary, extortion, intimidation, kidnapping, robbery, and weapons violations.
Highly organised with a supreme leader and a central committee, the group operates primarily in the states of California and Maryland promoting an anti-government philosophy.
The gang gets income from distributing cocaine and marijuana obtained from local Mexican drug traffickers, and it's also involved in auto theft, burglary, drive-by shootings, and homicide.
Three prison inmates created the Dead Man Incorporated in the 1980s in the Maryland Division of Corrections.
In 2006 leadership told a member to begin recruiting in Virginia, so he assaulted a cop to get into the system. Dead Man has started swallowing up smaller gangs and is now one of the largest prison gangs in Maryland.
The gang is involved in murder-for-hire, acts of intimidation, violence, and drug distribution.
One of the largest and most violent gangs in America, Ñeta has chapters both inside and outside prisons in 36 cities and within nine states (primarily in the Northeast).
Ñeta's main source of income comes from distributing powdered and crack cocaine, heroin, marijuana and, to a lesser extent, LSD, ecstasy, meth, and PCP.
Ñeta members also commit crimes including assault, auto theft, burglary, drive-by shooting, extortion, home invasion, money laundering, robbery, weapons, and explosives trafficking and, witness intimidation.
The Hermanos de Pistoleros Latinos, a Hispanic prison gang with about 1,000 members, was formed near Laredo, Texas, in the 1980s.
HPL also operates in several cities in Mexico, particularly Nuevo Laredo. HPL keeps close ties with Mexican drug cartels and is involved in trafficking large quantities of cocaine and marijuana from Mexico into the U.S. for distribution.
In 2007 members of HPL were charged with stealing large loads of narcotics from McAllen, Texas, drug traffickers and reselling the drugs.
Public Enemy Number One (PEN1) is the fastest-growing 'white power' prison gang in the U.S., with chapters sprouting up on both coasts and in the South.
The group has amplified its power by forming an alliance with the Arayan Brotherhood and the Nazi Low Riders.
PEN1 members, like a lot of white power groups, push meth. They've also engaged in assault, attempted murder, homicide, auto theft, burglary, and identity theft.
Formed in California prisons in the 1950s, the Mexican Mafia has about 400 members who follow strict rules.
Mainly comprised of Mexican-American males who previously belonged to a Southern California street gang, La Eme is a powerful California gang.
Its main source of income is controlling gambling and prostitution within the prison systems in addition to extorting drug distributors outside prison and distributing meth, cocaine, heroin and, marijuana in prisons and on the streets.
Its members are very connected to Mexican cartels.
The Nazi Low Riders (NLR) is a white supremacist gang based that operates in prisons and communities around the Pacific and Southwestern regions.
The members, most of whom have a history of street gang activity and drug abuse, move meth as well as smaller amounts of heroin and marijuana.
NLR have also been involved in armed robbery, assault, assault with deadly weapons, murder and attempted murder, identity fraud, money laundering, witness intimidation, and witness retaliation.
Source: U.S. Department of Justice
Also known as the Texas Mexican Mafia, Mexikanemi was formed in the early 1980's in Texas prisons and most members are Mexican nationals or Mexican-American Texans.
Mexikanemi runs a huge drug-trafficking operation involving cocaine, heroin, ecstasy pills, marijuana, and meth in the Southwest, particularly in Texas.
Its members are tight with Mexican cartels, especially the paramilitary group Los Zetas.
Nuestra Familia is an extremely violent gang that originated in the California prison system.
Its subordinate Norteños, consisting primarily of Mexican-American gangsters from Central and Northern California, has more than 1,000 members.
The gang gets money from extortion as well as distributing cocaine, heroin, marijuana, and meth in Pacific prison systems as well as in outside communities.
Nuestra Familia is also involved in homicide and robbery.
Source: The U.S. Department of Justice
AB is primarily active in the Southwestern and Pacific regions of the U.S., but its reach is expansive -- the FBI estimates that while the gang makes up less than 1 per cent of the prison population, it is responsible for up to 18 per cent of murders in the federal prison system.
The gang's income comes distributing cocaine, heroin, marijuana, and methamphetamine within the prison systems and on the street.
The gang is not to be confused with the Texas Aryan Brotherhood, which is a separate group founded by Texas prisoners who were denied admission into the AB.
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