"nearly a half century ago, researchers found that a small number of juvenile offenders- 6 percent-were responsible for a disproportionate amount of the violent crime attributed to a group of nearly 10,000 individuals. further studies have supported the idea of a "chronic 6 percent" and, in the process, provided law enforcement with one of the most useful concepts in the history of criminology known as "

The answer is Chronic Offender

Explanation:

Chronic offender is the term used by the criminology to define who has frequent interactions with law enforcement and has a lengthy history of arrests, commonly for the same or similar crimes. Normally, refers to a small number of people that are responsible for a large percentage of crime.  

it took two men to wrestle rome back from chaos and turn a republic into an empire. in the first century bc, rome was a republic. power lay in the hands of the senate, elected by roman citizens. but the senators were fighting for power between themselves.