It depends on which street gangs are you referring to as the L.A gangs usually have no hierarchy but a collective structure, or are you referring to Chicago gangs which have an hierarchy. If you mean the latter , then you be amazed at the fact that Chicago's gangs are equal or more organized than any la cosa nostra family. Also, the members do know their leader by his nickname.
street gangs are not even close to being more organized that mob famlies. If they were how do you explain the record numbers of street gang shootings in chicago