NEW YORK - Thousands of protesters, counting in unison from one to 50 to mark the number of shots fired by police in the death of an unarmed Queens man last month, clogged Fifth Avenue on Saturday in a “Shopping for Justice” protest three weeks after the slaying and one week before the Christmas weekend. Trent Benefield, 23, one of the survivors of the Nov. 25 shooting that killed Sean Bell, led the marchers from his wheelchair as they headed south through midtown Manhattan. He was encircled by bodyguards, and followed by a group of clergy and elected officials on...