Season 4 |
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| 39 :04x02 - Devil's Fire (Feb/12/2009) | | The gang known as the Pagans are considered a major dealer in the methamphetamine trade, originating in Maryland during the 1950's and has expanded to 44 chapters with over 900 members along the east coast. | |
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| 40 :04x03 - Divide and Conquer (Feb/19/2009) | | The Latin Kings have roots tracing back to the 1940s in Chicago, and are regarded as the largest and most brutal Latino gang in the U.S.A.. | |
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| 41 :04x04 - Kill 'Em All (Mar/02/2009) | | A gang of ruthless contract killers, The Best Friends, have roamed Detroit's east side since 1985 and have been linked to more than 80 murders, according to the federal officials. | |
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| 42 :04x05 - Kill or Be Killed (Mar/12/2009) | | Memphis, Tenn. is the site where a group of drug dealers and killers formed the gang, the Love Murdering Gangsters (LGM), and is regarded as the most notorious gang in the Mississippi Delta. | |
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| 43 :04x06 - Boys of Destruction (Mar/19/2009) | | There are an estimated 10,000 gang members who call St. Louis their home, which includes the notorious gang, Boys of Destruction. | |
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| 44 :04x07 - Aryan Terror (Mar/26/2009) | | The white supremacist Aryan Brotherhood started as a means of survival, has now become the largest prison gang in Texas and has spread to the suburbs of Dallas. | |
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| 45 :04x08 - Silent Slaughter (Apr/02/2009) | | Colorado's largest motorcycle gang, the Sons of Silence, has increased to 36 chapters around the world since being formed in the 1960's. Agent go undercover to infiltrate the groups. | |
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| 46 :04x09 - Killing Snitches (Apr/09/2009) | | A task force was formed in 2003 to take down the Hidden Valley Kings, a gang which ran the drug trade in Charlotte, N.C. | |
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| 47 :04x10 - Everybody Killers (Apr/16/2009) | | The Hoover Criminals are a nightmare for those in Portland, Ore., and have moved in from Los Angeles during the 1990's to get in on the drug business, and call themselves "Everybody Killers." | |
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| 48 :04x11 - Dead Man Inc. (Apr/23/2009) | | Dead Man, Inc.are the biggest threat inside the Maryland prison system and have grown to 14,000 members within a decade and spread across the country. | |
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| 49 :04x12 - Biker Wars 2 (Apr/30/2009) | | The Mongols and Hells Angels are a pair of outlaw motorcycle gangs entrenched in a brutal California turf war. | |
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