1. ‘Our Numbers Grow Every Year’ On a misty November morning just after sunrise, I pulled up to a shooting range in central Texas with a borrowed AR-15 and a few hundred rounds of dubious-quality Russian ammunition that I’d ordered over the internet. I followed a pickup down a gravel road and over two cattle guards to the far end of the property. Then I parked in a field ringed by trees whose bark was scarred by stray bullets. A handful of men had already arrived, and they were loading ammunition into their magazines as the morning birds chittered overhead. After a while, a decorated U...