<Tr> <Td> Ruben Castro Raul Leon Francisco Martinez </Td> <Td> 03328 - 112 95335 - 198 91147 - 011 </Td> <Td> </Td> <Td> 9999 - 99 - 99 Serving life sentences . </Td> <Td> Leaders of the Mexican Mafia; convicted of racketeering and murder conspiracy for running violent drug trafficking operations . </Td> </Tr> <Tr> <Td> Tyler Bingham Barry Mills </Td> <Td> 03325 - 091 14559 - 116 </Td> <Td> </Td> <Td> 9999 - 99 - 99 Serving life sentences . </Td> <Td> Aryan Brotherhood prison gang founders; transferred to ADX in 2006 after being connected to violent gang activities in prison; convicted of murder, murder conspiracy, and racketeering for ordering the killing of two African - American inmates at USP Lewisburg in Pennsylvania . </Td> </Tr> <Tr> <Td> Silverstein, Thomas Thomas Silverstein </Td> <Td> 14634 - 116 </Td> <Td> </Td> <Td> 2095 - 99 - 99 Serving a life sentence . </Td> <Td> Aryan Brotherhood prison gang leader (considered one of the most dangerous inmates in the federal prison system); transferred to ADX after murdering Correction Officer Merle Clutts at USP Marion in 1983 while serving a sentence for bank robbery . Silverstein's crime was the reason for the construction of ADX . </Td> </Tr> <Tr> <Td> Hoover, Larry Larry Hoover </Td> <Td> 86063 - 024 </Td> <Td> </Td> <Td> 9999 - 99 - 99 Serving 6 life sentences . </Td> <Td> Leader of the Gangster Disciples in Chicago; sentenced to life in state prison in 1973 for murder; convicted in 1997 of drug conspiracy, extortion, money laundering, and running a continuing criminal enterprise for leading the gang from state prison . </Td> </Tr>

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