TOBYHANNA, Pa. - When New Yorkers and Philadelphians want to get away from the noise and crowds, they often come to the Pocono Mountains of northeastern Pennsylvania. It's a bucolic, tourist-friendly place of forests and streams and lakes, a place where you can play a round of golf, take in a show, angle for trout or simply lose yourself on a country road. A place where a Crip or a Blood would seem ... out of place. Yet, jarringly, they are here: gang members from New York City and its suburbs who authorities say have quietly taken up residence in...