Understanding how prison gangs work is difficult: they conceal their activities and kill defectors who reveal their practices. This past summer, however, a 32-year-old academic named David Skarbek published The Social Order of the Underworld, his first book, which is the best attempt in a long while to explain the intricate organizational systems that make the gangs so formidable. His focus is the California prison system, which houses the second-largest inmate population in the country—about 135,600 people, slightly more than the population of Bellevue, Washington, split into facilities of a few thousand inmates apiece. With the possible exception of North Korea, the United States has a higher incarceration rate than any other nation, at one in 108 adults. (The national rate rose for 30 years before peaking, in 2008, at one in 99. Less crime and softer punishment for nonviolent crimes have caused the rate to decline since then.)
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