From 'Combating Violent Crime: 24 Recommendations to
 Strengthen Criminal Justice', US Dept of Justice, office of the Attorney
 General 7/28/92.

From the cover letter, written by Attorney General William Barr:

 "The problem of violent crime in America is largely the problem of
  the repeat, violent offender.  A small segment of our population
  is responsible for a large share of the violent crime.  Study after
  study has identified a small group of hardened, chronic offenders
  who commit a staggering number of crimes -- well over one hundred a
  year for many of these violent predators."

Pretrial release of violent felons, pg 2:

 "A study of pretrial release in 75 of the nations' most populous
  counties in 1988 found that 18% of released defendants were known
  to have been rearrested for the commission of a felony while on
  pretrial release.  2/3 of those rearrested while on release were
  again released"

 BJS 'Pretrial Release of Felony Defendants 1988' [1991]
 Lazar Institute 'Pretrial Release: an evaluation of
  Defendant Outcomes and Program Impact' [1981]

Effective deterrence and punishment of adult offenders, pp 6-7:

 "It is no mystery why this is the case.  Again and again, studies have
  indicated that a relatively small portion of the population is
  responsible for a large percentage of the criminal violence in this
  country.  One California study found that 3.8% of a group of males
  born in 1956 were responsible for 55.5% of all serious felonies
  committed by the study group [5].  A Philadelphia cohort study
  conducted by Professor Marvin Wolfgang of UPenn found that about
  7% of males in two birth cohorts (1945 and 1958) accounted for over
  2/3 of all violent crimes commited by each group [6]."

[5] from Robert Tillman 'Prevalence and Incidence of Arrest among
    Adult Males in California' [1987].  Study size was 236,000 men
    born in 1956 from ages 18-29.  The study counted all FBI index
    crimes committed by the group - murder, nn manslaughter, rape
    robbery, agg. assault, burglary, larnecy and mv theft.

[6] See PE Tracy, ME Wolfgang, RM Figlio 'Delinquency Careers in Two
    Birth Cohorts, pp 279-80' [1990]

again, p 14:

 "Similarly, one study by the BATF of a group of career criminals
  found that each had committed an average of 160 crimes per year [21].
  A 1982 Rand Corp study found that 24% of inmages surveyed admitted to
  having committed more than 135 crimes a year apiece, and about 10%
  claimed responsibility for over 600 crimes per year [22]."

[21] BATF "Protecting America: the Effectiveness of the Federal Armed
     Career Criminal Statute" p 29 [1992]

[22] Jan M. Chaiken, Marcia R. Chaiken "Varieties of Criminal Behaviour"
     p 215 [1982]

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