A 15-year-old aspiring police officer was stabbed to death by members of a Dominican gang known for having illegal aliens in its ranks, according to reports. In what NYPD Chief Terence Monahan is calling “among the most brutal crimes I’ve seen in my 36-year career,” Lesandro Guzman-Feliz was ambushed and hauled out of a Bronx bodega by suspects wielding knives and machetes and “slaughtered...