no ester familia is known as nf. or the family. the junior high school to their high school would be the northern structure. >> the northern structure is composed of california hispanics from north of los angeles. >> the nazi low riders, they refer to themselves as the nlr. >> the nazi low riders is a white supremacist gang formed in the '60s. membership can only be achieved by killing someone, and death is the only way out. >> the bgf is the black guerilla family. >> the black guerilla family is the only recognized black prison gang. street gangs like the crips and bloods are merely regarded by prison officials as disruptive groups. but the most notorious gang in the california prison system is called the mexican mafia. >> the mexican mafia is known as m.a., la m.a. they will be recognized by the eme, which is the spanish letter "m." >> the mexican mafia was born in california prisons in the mid 1950s. its members, who swear allegiance for life, are mostly mexican-americans from southern california. among gangs, the mexican mafia