Hundreds of protesters wearing keffiyehs flooded Brooklyn’s DeKalb Avenue station last month, dodging police in riot gear to hop the turnstiles en masse. Their collective refusal on September 20 to pay the $2.90 fee required to ride the subway was an act of protest: Just days before, on September 15, a New York City Police Department (NYPD) officer shot haphazardly onto a train platform in pursuit…