A gigantic prison population in the U.S. has unsurprisingly begat an intricate illicit social order behind bars. The crime hasn’t truly disappeared–it’s just been disappeared into cells. From Graeme Wood’s new Atlantic article, “How Gangs Took Over Prisons“:

“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.)

Skarbek’s primary claim is that the underlying order in California prisons comes from precisely what most of us would assume is the source ofdisorder: the major gangs, which are responsible for the vast majority of the trade in drugs and other contraband, including cellphones, behind bars. ‘Prison gangs end up providing governance in a brutal but effective way,’ he says. ‘They impose responsibility on everyone, and in some ways the prisons run more smoothly because of them.’ The gangs have business out on the streets, too, but their principal activity and authority resides in prisons, where other gangs are the main powers keeping them in check.

Skarbek is a native Californian and a lecturer in political economy at King’s College London. When I met him, on a sunny day on the Strand, in London, he was craving a taste of home. He suggested cheeseburgers and beer, which made our lunch American not only in topic of conversation but also in caloric consumption. Prison gangs do not exist in the United Kingdom, at least not with anything like the sophistication or reach of those in California or Texas, and in that respect Skarbek is like a botanist who studies desert wildflowers at a university in Norway.

Skarbek, whose most serious criminal offense to date is a moving violation, bases his conclusions on data crunches from prison systems (chiefly California’s, which has studied gangs in detail) and the accounts of inmates and corrections officers themselves. He is a treasury of horrifying anecdotes about human depravity—and ingenuity. There are few places other than a prison where men’s desires are more consistently thwarted, and where men whose desires are thwarted have so much time to think up creative ways to circumvent their obstacles.”